Is the child in your stomach my brother-in-law who died?

It depends on the religion, denomination, and ideology you believe in, but in my case of the Jodo sect, everyone who died believes in the teaching that they go to the Pure Land of Paradise, so they are almost never reborn.
However, due to genetics, the husband's parent's inheritance is passed on to grandchildren, and as a result, the possibility that they have characteristics similar to their brother-in-law is also not zero. The same goes for children who have already been born.
But the important thing is to look at your child as an individual, not as a brother-in-law, even if they have similar faces or characteristics. No matter how similar they are, they're not the same people. Please love your child as a different person no matter how similar they are.
Please concentrate on giving birth without worrying about anything.
May your child give birth safely and grow up bright and healthy.

mother-in-law...
I'm free to think about my late son in my heart, but speaking it out and letting the baby in my stomach listen to it is a bit annoying, isn't it?

Of course, there is no such thing as reincarnation. This is because the Buddha's salvation is not something that is reincarnated; it is something that is welcomed into the Buddha's world, so it is not born into this world as a separate life. My brother-in-law and my baby are separate.

However, if the mother-in-law made such an assumption and replaced the pain of death with the birth of a new life, she may believe that way for a long time from now on, and say things that the brother-in-law will also have an influence on children born.

More than asking about whether there will be reincarnation, I want to keep a close eye on my mother-in-law's behavior.

“In Buddhism, it is not about being reborn as a different person, but rather that they are born into the world of the Buddha. I'll tell them, “Please love this kid as this kid.”

It's fine. Your child will be born receiving your love.

Your husband's older brother, who went wild due to a mental illness and caused a lot of trouble to people around you, will not be reborn as your child.
Don't worry about that.
Please treat the child that will be born as a child of only two, you and your husband.
Even so, it is said that your mother-in-law is usually nice to you, but I am surprised that she makes completely heartless remarks.
It's natural for you to feel bad (some people may be even more emotionally disturbed).
Unfortunately, the mother-in-law probably still cannot accept the fact that her son suffered from a mental illness and died as a fact.
Maybe they're being driven by a sense of remorse.
If you say such a thing to your younger brother's wife, you should be able to understand how much your partner will get hurt, so it's not a proper state of mind.
However, there is no need for you to sympathize and agree.
If you decide to ignore that story, your mother-in-law will one day regain her normal mind and sincerely apologize to you.
If you just can't stand it right now, tell your husband, “Stop saying such stupid things. It's possible to have them admonish, “You don't understand how hurt your wife is.”

It cannot be common sense for humans to be reincarnated into humans.
It's not that “with common sense, reincarnation is impossible,” it is that “reincarnation is common sense in Buddhism, but it is impossible for humans to be reincarnated into humans with common sense in Buddhism.”

If you don't keep the Five Commandments, you won't be born a human in your next life.
Since we kept the Five Commandments in our previous lives, it seems that we are now being born humans.
I don't really understand, but that's what I'm hearing.
I think that's actually the case.

The Five Commandments are “immortality (do not kill living creatures), immortal theft (do not steal), infidelity (do not commit infidelity), indecent speech (do not lie), and do not drink alcohol (do not drink alcohol).” It comes up right away in AI-assisted searches.

Also, in Buddhism, physical actions, saying such things even when not acting with the body, and thinking so in the heart are all treated the same way. So killing is true if you say “I'm going to kill you,” and it's true even if you think “I'll kill you.”

Therefore, it is impossible for humans to be reborn as humans.

I don't really understand why I can easily assume that if I can exert mystical power in this world by strongly thinking and hoping for something.

She was born safely, partly because of her mother-in-law's thoughts. As the mother-in-law really knows, this child's life is this child's life, and they have an irreplaceable life. My brother-in-law was able to live my brother-in-law's irreplaceable, unique, and irreplaceable life. No matter what anyone said, my brother-in-law was able to live my brother-in-law's life. While receiving the warm feelings of her mother-in-law, this child lives this child's life.

It's 100% fine.
“Fact/reality” and “information/assumption” are different things.
Let's have correct perception and understanding from a clear perspective.

However, let's draw out the forgiving and generous Buddha's mercy, the mother's heart, which is full of compassion, from the depths of her heart.
The Buddha's compassion means that both the mother-in-law and brother-in-law are the same people, forgiving in common due to weakness.
Your husband, your paternal ancestors in that house, and your paternal and maternal ancestors are gone.
You are also a descendant of the 00th generation from the point of view of your ancestors. From a grandparent's point of view, grandchildren. From a parent's point of view, a child, a daughter. So are my mother-in-law, brother-in-law, and husband. Everyone is someone's descendant. Everyone is, however, the one and only precious person in heaven and the world, DE separate beings.
However, current thinking won't save you. This is because I have fallen into the thought that neither I nor the people I deal with can be saved. First, please forgive your weak self.
Then, let's look back at the fundamental principles of things, the roots, humans, and the fundamentals of life.
You are now going to be the mother and mother of your new child.
So if you take a hundred steps, you should be able to understand a little bit about the feelings of a mother-in-law who lost her child.
No matter who they are, they are cute to the mother of the world, no matter what kind of child they are. So, for the mother-in-law, the deceased child = brother-in-law took a lot of effort, so it was difficult for the mother-in-law. It means ❝ I had no choice but to worry about it ❞. She was also in a difficult position as a mother-in-law. It means that even now, we are in a state where we cannot be saved from a spellbound mentality. I want to save them. It would be disrespectful to you and your child. You've been given a new life, and your mother-in-law is just so sick because you lost her.
Please don't worry about yourself and stay calm.
They take 10 billion steps and look back at “Oh, I and this child are grandchildren in my grandparents' generation, and they will eventually be parents.”
It seems that if they are preceded by their own children, a mentality of escaping from the mentality of parents not wanting to accept reality develops. Therefore, it probably also makes you want them to be born again as a new life. Just because that heart was directed at you, who was close to you, it's not something we should deal with properly.
You're not that far from it right now.
Anyway, please put yourself first without thinking about what you need for your child, mother, or yourself to rest.
Oh, if you keep in mind that you're not the only one in pain, you'll be freed from a small point of view, and you'll be able to open up a calm point of view.
I pray for safe delivery.

There is no direct and reliable way for us to know the state of the reincarnation of life itself. When I want to know something I can't know, my delusions rise, and my worries only increase.
From the standpoint of Buddhism, reincarnation is thought to occur instantaneously without interruption, so if your brother-in-law were reincarnated, you were already reincarnated into one of your lives at that moment when you passed away.
Even if there is no instantaneous reincarnation for some reason, reincarnation occurs within a period called the middle, which is a maximum of 49 days, so reincarnation into a life that occurred after that is impossible.
In this way, there is almost no possibility that lives that have arisen at intervals in time are related to each other in the past and later generations of reincarnation. I think it's okay to think that you don't have to worry about anything like the one in your question.