To begin with, one of the biggest advantages of love marriage is that it
freesexempt the parents from their responsibility of choosing life partner for their children.
Good sentence. But I just want to show you a more suitable word here.
believe that in performing them with the permission and agreement of parents.
I am sorry,but I think that most people including me are confused about what you are trying to say here. Please make your point clearer.
feedingrear/foster their own children,
Again, good sentence. Just show some new words.
In fact they understand their children and its needs
My version: In fact, they have a better idea of their own children and what they really needs in their marriage.