To what extent do sisters who have not received their apartments have the right to demand their rights from sisters who have received apartments after the contractor went bankrupt? And do their paternal uncles have a right to the house that they permitted their father to dispose of?

There is no validity to the uncles waiving their share of your father's house during his lifetime. Rather, a valid waiver occurs after his death. If they waive their share while they are adult and of sound mind, there is no harm. However, if any of them is a minor, his waiver is not valid, and he must receive his share or be compensated for it.

If the contractor stops construction and you cannot compel him, the existing apartments and those already sold must be divided among all the heirs. Whoever took more than his right is obligated to pay those who did not receive their full right. If one of the heirs is in need or has sold her apartment, this does not affect the obligation to render rights and divide them justly. If one of the heirs is in straitened circumstances and cannot pay what he owes, he must be granted a delay.