Your husband's current income has nothing to do with what he owes in back child support. If he owes money to his kids then he owes money to his kids. The money may not be able to be taken from him because it is social security but he still owes the money and should make arrangements to pay it.
To protect your child(ren), still file with Domestic Relations Court. However, be prepared that the Judge could suspend any order for now.
No.
Only if the child is still under 18.
Your Social Security eligibility is not affected by your receipt of child support. One is for you; the other is for your child.
Yes, if there is a valid court order for child support and/or child support arrearages.
Not on SSI. If she is on SSD, than there is a separate child benefit check. However, it should be stated that the child does not have the legal right to move, and if a child support order is in place, it must still be paid until the court rules otherwise. see link below
Social security
There is no such thing as "social security child support." If the child's parent(s) is eligible for Social Security, the child is probably eligible, also. In such a case, the child's benefit is considered child support. If that benefit exceeds the amount ordered for child support, the obligor does not owe any additional payment.
Social Security is income for purposes of determining amount of child support.
Yes, but child support received must be reported to Social Security (or it's fraud).
Yes
Yes, but not from SSI.
Child support is an obligation, social security is a source of income. They really have nothing to do with one another. If you are asking if she can garnish your social security, the answer is yes. Section 459 of the Act (42 U.S.C. 659) allows Social Security benefits to be garnished to enforce child support and/or alimony obligations;
As he's on SSD, none at all.