Yes. She has until the child turns age 18 to file for 2-18 years of retroactive child support, depending on individual state limits, though some judges are beginning to deny them. Judge David Grey Ross, Commissioner of the Federal Office of Child Support Enforcement until 2004 opposed the practice. Once a child reaches age 18, they can file up to the age limit for the state from age 19 to 23, but the retroactive amount is still limited to state guidelines and the cutoff period for that state. In New York, at age 18, the child cab receive five years retroactive with another three years continued support until age 21. The father cannot be awarded any enforceable parental rights to a child that has reached the age of majority, but in Mississippi, the age of majority is age 21.
if the mother terminates her rights can he collect child support from the mother if child lives with him?
Reference to "seventy four percent" is unclear, but it seems unlikely that the child's mother could collect current child support in such a situation. (She can still collect past-due support, if any.)
You don't - You explain the benefits that support could provide for the child.
No, the father must support his previous child. You knew this when you had a new child with him.
File for in and they will contact Canada.
If the mother has the full custody then she can take the child, and she can get the child support. If she doesn't have the full custody, then she is not allowed to take the child without the father consent, but she still can get the child support.
Marriage of the mother, father or child have no relationship to the collection of a debt.
The father can file for this change.
In a word, No.
Not without the permission of the courts and the mother, AND provided the mother is not, nor will in the future, collect AFDC.
no the mother should have the legal obligation to take care of the child
You need to see an attorney (lawyer)