Will I be sinful if my mother backs out of marriage because of me, while I insist on staying in her home, and is it obligatory for me to live with my father if my mother gets married?

There is no custody over a girl after puberty. She has the right to choose to reside with either of her parents, and she may remain in her mother's home if that avoids harm. If the girl wishes to live in her mother's home after having left on her own, some jurists have permitted it if she is in a state where no harm is feared for her, but it is not advisable. The brothers should be advised about their shortcomings in visiting their mother and reminded of her rights over them and the danger of falling into the severing of kinship ties.