The mother ages but the father doesn't!
The mother looks 15 or more years older with the short hair and glasses when Selena is played by Jennifer Lopez, but the father's age stays the same throughout the movie.
shareBecause the actress who played her mother looked awfully too young to play the mother of a 20-23 year old woman. They would basically look NOTHING like mother/daughter if they didn't transforming her to look more middle aged.
The actor who played the father on the hand, naturally looked middle aged, so there was no need to change him.