mum and dad;   father and mother;   parents
One's obligations as a child to one's parents
To obey/respect one's parents
To be dutiful to one's parents
The parent-child relationship
Have you told mum and dad?
You cannot but ask your parents' advice;  You cannot but ask your parents for advice;  You have no alternative but to consult your parents
parental
Parental duties/responsibilities;  Parental liability
A girl must marry the young man (that) her parents have  selected for her