Sometimes SSA stands for Social Security Retirement income, because the retirement benefit is called an "A" benefit. A wife's is a "B" benefit; a child's is a "C" benefit, and so on.
Some will call SS retirement SSA to differentiate from SSD, or disability benefits.
Also, if there is a court order for child support, unless it is modified, the court orders stands while the inmate is incarcerated. This creates a large burden for the inmate, because while incarcerated, he cannot earn any significant money (inmates are frequently paid 87 cents an hour), so they cannot comply with the court order. Unless, of course, they have assets which can be sold to satisfy the order.
It is a very ticklish situation for all.