“Child raiser” is perfectly adequate to the context of a conversation about people who are raising children.
And since we’re being technically correct, raising a child is always optional (even for the parent).
I wouldn’t consider a parent who opts out of raising their child to be a child raiser.
"No man goes into education to be called 'instructor', they're 'teachers'."
"No woman goes into CS to be called 'coder', they're 'developers'."