We all have personalities which are a collection of emotions and traits that characterize us. It is the way we think about people and how they see us. Of these traits and characteristics some we are born with but many of them we learn from the experiences we have in the family which we grow up.
It definitely benefits the child if the parents or the grandparent is aware of this and can help the child develop a good personality through their own example.
Values, faith, and experiences all influence young people in the first years of their lives. This needs to be recognized and proper training implemented early on.