Since the proeprty was in the name of your mother she will e considered as its sole owner and on her death it will be inherited by you ,your sisters and father in joint share.
So your father could not have claimed her sole right over this.
What he did was wring and beyond the purview of law and hence you can still challenge his actions aad seek your share in the proeprty as well.
To do so file a suit for declaration , partition and injunction to you are given your undivided 1/3rd share in the proeprty.