parent and child
Refers to the relationship or pair of a parent and their child. Often used in compounds like 親子丼 (oyakodon, a rice bowl dish with chicken and egg).
The parent and child took a walk in the park together.
The bond between parent and child is strong.
The parent and child went to the park together.
They deepened their parent-child bond through the trip.
host association
parent-child relationship
extension phone (and its main line)
Kana spelling is common in everyday writing, especially when the kanji is not needed.