Civil case and Criminal

My mother presently 92 years had bought a flat in the year 2001. She put my brothers name first and her name second. After my brothers marrage he was harassing my mother, following her on the road to see where she is going, putting the light and fan off and keep her in darkness, abuse her forcing her to give the full house to him. My mother has now put civil and harassment case on my brother. Due to her old age she came to stay with me and then on she is staying with me her daughter since 2019 Now redevelopment is happening of my mother building and the society has sent a form for my mother to sign for the building to go for redevelopment. MY HELP IS 4 WHEN CASE HAS BEEN PUT BY MY MOTHER ON HER SON TO BE PUT OUT OF THE FLAT AND FOR HARASSMENT. Should my mother sign on the redevelopment form. If she does not sign will it be a problem for my mother can builder take action on my mother can society take action on my mother should my mother sign or not. who will get the rent, transport, broker etc of the builder when the case is on please help with the above questions