All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
What the mother did in distributing the inheritance while she was still alive is not valid as an inheritance; rather, in this case, it is considered as a gift and the gift should be divided equally (among you).
For those who did not take their share from this gift until now, then they are entitled to take it now or after the death of the mother.
If something remains from the properties of your mother and it was not from the gift that she distributed in her life, then it should be divided as inheritance on those who are entitled for it.
Finally, we advise you to take the matter to an Islamic court in order to put an end to disputes between you.
Allaah Knows best.