The mother can apply to pay for her and her child. For the child to do so (if she's a teen mom for example) they will count to see how much income the household have first since she lives with her parent. You really need to ask a social worker since you leave very little details.
No.
No, but the child is potentially eligible for RSDI payments based on his disabled father's eligibility, and these payments would count toward the father's child support obligation.
no
I know if you receive SSI or SSDI you have not paid enough into the Social Security fund to receive legitimate Social Security so therefore it cannot be garnished for child support. So if they were not gainfully employed long enough to accrue some social security they do not have to pay you support.
The father can file for this change.
No, child support can only be taken from the birth parents.
Social Security is income for purposes of determining amount of child support.
Social security
Marriage of the mother, father or child have no relationship to the collection of a debt.
Yes, provided the separated parent is the father.
This can be the case yes depending on the disability, insurances etc.
Yes, if the father has more time with the child than the mother, she will owe him child support.