Indeed, the adult child of the parent. The word child in English can refer to a very young person, but also commonly refers to the progeny of a person, as in the comment you were responding to, where child was used in reference to the parent that was also referred to in the comment.

To a parent, they will always be their child.

> OP is talking about a full grown adult. Not a child.

This is an interesting tangent to me. What makes a full grown adult? Is it being able to drive a car? Being able to serve in the military? Being able to drink? Vote? In the state where I grew up, these were all different ages.

And then there’s the scientific notion of when the brain is “finished” developing and maturing in the mid- to late-20s.

English is not my native language, what word should I have used ?