Mother and daughter in law, Is mother in law a monster, mistake that spoils beautiful relations

Each girl is very lucky . After a certain age they get married and have two mothers, two fathers, two houses and brothers and sisters in both houses. A new II life starts here. Every thing in life needs some commitments . A girl with her love and affection can turn her house into heaven . Some time,some patience and some efforts are needed for it. It should be a joint effort from all family members. Certain mistakes should be avoided.