Why a child is carrying only father's surname ?

Hey All... I was just sitting and thinking like this..because as my 14 years of motherhood experience I have gone through several ups and downs though pregnancy as well as in motherhood...here in India most of us expect a mother should be totally a giving machine and a pond of sacrifices..should not have any dreams which she had in past... Always our society ask like why your child has do this not done this ...bla ...bla..why everytime they are asking details evolution of your child to a mom? Why not to father..does not he has any kind of responsibilities 🤔? In India men think like giving money only is the way or equal to responsibility..is it ?? Day and night how a mother suffers does anyone even think! From pregnancy trauma to adulthood guidance mostly provided by a mom..there is no involvement of a father can be seen mostly in families.. After a marriage a girl totally gives her 500 percent effort, eventhough she was a very talented girl in her time...she doesn't go any ...