Hi,
In my humble understanding, whatever your father-in-law and husband did, in terms of remedy was perhaps to address their own Karma. It will perhaps not address yours.
Personally, I don’t necessarily suggest expensive remedies. Unfortunately, I’m unaware of alternate options. I believe Phala or benefit of doing anything in person is much better/higher and something done by force will be limited. So, I’ll leave it to your wise discretion on for the way forward.
Although there are small possibilities, in my humble opinion, your aspiration for buying a house will have to wait a little bit.
Take care…