you had raised similar query earlier .you have with some cosmetic changes raised this query again .
please answer whether husband left a will or he died intestate .?
if he left a will she is absolute owner of property . she can execute a gift deed in favour of her son B to exclusion of other sons .
if husband died intestate she is only one of legal heirs and cannot execute gift deed for entire property of her late husband . all children are bound to maintain the mother in her old age .