About debts from acquaintances

It's probably not that there was malice to overthrow it from the beginning, and it's probably a situation where they are being burdened with responsibility for debts as joint responsibility.
(No`) We are not experts on money matters, so I would like you to consult with an expert about that, but I will only talk about the psychological aspect.
There is no doubt that the root of the problem is that if I say without personal feelings, I should ❝ return what I borrowed ❞. It may be difficult, but that is the custom of this world. If it's not an unscrupulous trader with excessive usury, I think we should respond in good faith to the other party's sincerity.
It's just a ❝ borrowed ❞ translation.
('▽｀*) First, let's break down the problem into several parts.
➀ Can I pay my debts? → I can't actually return it. But I'm going to keep on giving it back.
② Your mother is worried, sorry, and you are worried. →I'm aware of this. Don't confuse them.
③ Should you even pay your mother's debts? →To the extent that there is no burden. You should have a life too.
④ What should I tell my mom → I can't pay up anyway, so let's just give up on feelings.
I'll take care of it in case of emergency, and I'll lighten the burden because it's okay to lie.
⑤ What should you think. →A parent's debt is a parent's debt.
If your mother passes away, and you get a call to pay off your parents' friend's debt, you can decide of your own will.
Debts are factual liabilities, but you don't have any mental liabilities.
I also have temple debts and loans left over, but most of the time I have them, I forget about them. Everyone in the world should have a home or car loan.
Looking ahead is depressing, so try to focus only on where you are walking right now, step by step, like a ladder staircase. Please go eat together. That alone should make mom feel better. That's because the most important thing is that they ❝ stay ❞ for me. Also, please contact us.

Certainly, loans are also debts. If you do that, I too will have a lot of debt.

Nevertheless, the reason I don't feel mentally burdened is that the repayment plan has been properly decided,
This is because they are making some way to repay it.

It is said that “they are being strictly pressured to repay,” so it may be quite difficult,
There is no choice but to move forward step by step from “time is now, at the foot of time.”
If you go beyond what you can do, it won't last long, so
Please tell your mother not to just overdo it.

I will do my best to repay it too. oh ho ho.

Mika herself raised money for her parents, and as a result she went bankrupt herself. Also, they are being asked by their mother to take on more debt. It's hard, isn't it? There is something unclear about the content of your question alone. We need to clarify the facts a bit more.

Based on your question
1. The management of the company my father ran deteriorated.
2. My father was the guarantor of the company's debts
3. Since I cannot receive additional loans from financial institutions, I also borrowed from relatives and acquaintances.
4. You also helped your parents pay off their living expenses and debts, but since you overdid it, you were forced to go bankrupt yourself.
5. My father's company went bankrupt, and my father passed away.
6. The company's debts were billed by the father, who is the guarantor, and after the father's death, claims were made to the mother.

What I'm not sure about in your question is about debts from acquaintances.
Was the tenant a company? Was Dad an individual?
Also, who was the guarantor of that debt?

I'm sorry for being an amateur, but as a future direction
①, sell your house and reduce your debt even a little.
(I've heard that when auctioned off, there are many cases where the bid is lower than the prevailing price. Ask a real estate agent, “Is it possible to sell the house?” “If it were possible, how much would it cost?” Let's listen and find out.
②, if the debt still remains, the mother will also go through self-bankruptcy procedures.
③, explain to your acquaintances that both you and your mother went bankrupt, and ask them to understand the current situation.

In any case, I think there is no choice but to consult with an expert about handling legal liability.
①, consult your municipality for free legal advice, or use Law Terrace (Japan Judicial Support Center http://www.houterasu.or.jp/index.html）に相談してみて下さい).
②. In that case, please sort out the facts by listing the lenders, borrowers, guarantors, collateral, and remaining debt amounts of the debt.
③ Explain that your home is a collateral property and is about to be auctioned off, and discuss whether it is better to sell it voluntarily.
④, Please explain that Mika herself has already gone bankrupt, and discuss her mother's self-bankruptcy procedure and her response to creditors.
⑤, after sorting out legal responsibilities, let's talk to a lawyer about how we usually fulfill our moral responsibilities to our acquaintances, etc.

Since you are filing a bankruptcy exemption claim, it is preferable to use individual civil rehabilitation.
Since there is bankruptcy property, it is distributed according to claims, but after that, it becomes natural debt.
It doesn't prevent you from paying if you want to.
The other party can't tell you to pay, but you'll be in a state where you can say they'll pay from here on out.

People who say sorry for not paying
It means you don't mind paying for it yourself.

That may not be the case right now, but it is quicker to fight in court.
It is also a good idea to use a judicial scrivener.
Incidentally, I worked for a judicial scrivener's office for 16 years.