They have enough money to live on every month. What they can't do without is a place to live.
Is is a bad offer you are making to them. Suppose they agree to pay half the monthly installment and eventually stops paying, you are back to square one. Your husband end up paying the full portion by autopay and they carry on living their happy irresponsible life at the expense of you and your husband.
To sum it all up, nothing changed on their part but as for you, you suffered all the harassment, mental torment, the guilt of having caused your mother physical injuries... Etc
Once again, you and your husband are being led around in circles and circles heading nowhere!
This flat is something your late father-in-law left behind as some sort of gift after his death so that his sons will have some assets to secure their living. It has no symbolic meaning to the family at all!!!!
Is your husband supposed to buy the place his grandfather and great grandfather and keep it as all 祖屋???
This whole 祖屋excuse is so lame .
Wake up and face it! You and your husband are being fooled again.