Not likely as the child is now an adult.
No, neither parent is required to help their child pay college tuition.
Legally, no.
No, not unless there is an additon to the court order that requests it.. Standard orders in the State of California end when the child turns 18 and is no longer a full-time high school student.
Sure, a parent can own a child of any age money!
No, not when the child is 18.
nope
Stepparents are not responsible for their stepchildren.
You can be a parent at any age, but if you have a child below the age of 18 you are still a minor, but with a child.
No they can not if any court has jurisdiction over the child or the other parent has visitation rights. In that case they need toe parent's consent and court approval.
kill the child
YES
Legally, as long as the child is 18, there are no obligations.