AITAH (or are we) for deciding to sell a house my husband's parents are living in, when the mortgage and title are under my husband's name?

We're both in our 30s, his parents in their 60s, his mum is Japanese, dad is British, all live in Japan. Back in late 2021, my husband decided to sign up for a house for his parents, a decision I was strongly against from the start, for a few reasons:

1. No investment value. They wanted to move to a country town in Japan. Houses in Japan depreciate in value, and it's even worse in rural areas.
2. We had just gotten married, and our savings weren't even enough for a deposit on a house for ourselves. I felt his parents were being selfish putting such legal and financial responsibility onto my husband. Yes they said they "pay" the mortgage, but let's be real the majority of their income comes from my husband's work. They run a family business (an English school in Tokyo), and my husband works 6 days a week while they work 3. Before the move, they worked 5 days a week. Hours varied, but my husband's schedule was mostly full. On top of that, his parents have a history of making poor financial decisions and still carry personal debt.

Anyway, my husband went ahead with it because back then he genuinely cared deeply about them. But that decision put enormous strain on our marriage, I felt like he consistently prioritised his parents over us.

Fast forward to now: we are planning to move to my home country permanently and are currently in the process of his partner visa.

My husband has since come to realise what a huge mistake he made. He now sees that his parents were manipulative and took advantage of his goodwill. A lot of things from his past and his upbringing have shed light on how his parents are essentially opportunists who use their children. He described it as a complete eye-opener. He blamed himself for not listening to me, and for not prioritising our marriage the way he should have.

We also discovered that because he's leaving the country while the house is still under mortgage, local laws mean he technically cannot continue with it. The mortgage contract stipulates that the owner must reside in the property. So we decided to sell. It's not really a choice, we simply cannot continue with the mortgage under those conditions.

My husband explained everything in detail to his parents, his sister, and his brother over the phone. We even prepared a lengthy written statement laying out all the context and the reasons we have to sell. We were as civil as we could possibly be.

Unfortunately, they went on the defensive immediately. His parents kept saying things like "it's our house" - which it is not. The bank technically owns it, and it's under my husband's name. They asked whether he could just not tell the bank about him leaving the country, which would mean deliberately breaking the law. His sister started saying things like "Mum worked so hard, she just wanted everyone to be happy." They also calling me selfish (which is ironic) asking why am I going back to my home country which we explained thoroughly already. They just didn't want to listen.

Then the next day, his sister showed up at my husband's workplace and accused me of cheating, saying I was going back to my home country to be with some other man and using his money. My husband was furious at her slander and the disrespect so he kicked her out immediately. My husband thinks his parents played a role in this accusation because back in 2021, my male friend had come over to help me fix my PC while my husband was at work. His father never found it appropriate at the time, even though my husband met him afterwards.

His brother tried a different tactic, using scare tactics about potentially breaking the law, which I rolled my eyes like mate yes, we'd be breaking the law if we didn't tell the bank and just left the country. That's exactly why we're selling.

My husband has never felt so alone in all of this. The people he thought were reasonable and supportive are rallying around keeping a house that has been nothing but debt and potential issues for my husband and I, it's not an investment, not an asset, just a liability. They want to keep it simply for the sake of having it, which seems to come from their own deep seated financial insecurity. Now they're all a bunch of salty balls, that think they are on the right and they think we are causing problem to the family.

So, AITAH or AWTAH for wanting to sell the house that parents are living in?

TD;DR: My husband bought a house for his parents in rural Japan in 2021, no investment value, and we'd just gotten married with minimal savings. We're now in the process of leaving Japan permanently and legally cannot keep the mortgage (owner must reside in the property), so we have to sell. His family responded by going on the defensive, angry at my husband, accusing me of cheating, and calling me selfish.