My late mother's superfund pay out went to the wrong dependents

My mother had a superfund with them ..they decided they will not comply with my mother's last wishes and instead give my mother's money to the wrong kids as my mother did not raise them their mother was working till she had a new baby by my late brother's cousin..now my sister that lived with my mother untill she died and held her had while she was dying are getting only 8% while my brother's x girlfriend gets 81% of my mother provident fund..my mother raised my sisters 2 kids from birth age 6 and 8 now ..how long will that 8000 last what wil she do after that ..my mother worked for them untill she died now they didn't even get a sent but they where my mothers actual dependents cos their father are in jail..yes my mother did help her with my brother's daughter but the other child is not even my brother ..now they get 80000 set for life while the real beneficiaries of my mother get peanuts ..now she and her new boyfriend will live off the money that my mother wanted my sister and her kids to have and they are gonna suffer now because of this decision that they made cos she stated how she wants her funds to be divided so she knows they are also taken care off..instead they give to someone that wasn't even at her funeral..to drink and do drugs as she and her boyfriend pleases while the kids that my mother worked so hard for gets nothing ..my mother is spinning in her grave right now ..cos she knows what she said and what she wanted for them