Well then you destroyed the family ....
How anyone can write such trash about the situation is incomprehensible. Just this defiant "Well." That is probably the most antisocial and disgusting behavior that can be shown. For me, you are an absolutely disgusting subhuman. Keep your thoughts to yourself; if you are that negative, keep it for yourself.
Here is a person who has invested savings probably accumulated over decades into a project for the family, and the project will probably fail due to crooked dealings.
How anyone can even think of throwing cheap shots there is beyond me. What a terrible life must you have to write something like that. I cannot even express my anger at your words here. You should be locked away here irreversibly.
Some good presentations regarding the construction were made here. The most important is that progress is being made. Sure, you want revenge, but lay your cards on the table and consider whether you really want to fight on two fronts. With a lot of discipline, hard work, and unfortunately more money than planned, the house can still be completed.
Ask friends and acquaintances. Someone always knows someone who wants to earn a little extra. There are several examples here in the forum of people who built very cheaply but with high quality with their circle of acquaintances.
I wish you all the very best. Such fates somehow always touch me personally very deeply.