The best way to settle a conflict is always to arrive at a consensus through peaceful talks and mutual discussions rather than stick to any one side and ignore the other.
in the given situation, since the person concerned doesn't find the views of the family members, convincing, he should try to convince them and mound their views to match his own.
just following his own choice shall hurt the family's sentiments and obeying the family members blindly shall surely be disloyalty towards the person you loves.
