A sister just married a brother and she has a daughter from her previous marriage. She asks if her daughter can unveil in front of the new husband’s father and brothers.
None of his family is a mahram to the daughter (neither his father nor his brother nor his son from a previous wife.) The father of the husband and the brother are allowed to marry the daughter of his wife. It is called “Rabeebah”. So, she has to be veiled in front of them.