I read your previous post, so I see your motive is greed and anger, which I expected.
When you work, money is taken out of your check to provide for you in the event you become disabled or too old to work. It may not cover all of it, but oh well. That is the way our system is. If you don't like it, leave.
So unless you are a vigilante who is also down in the hood spying on the girl who keeps having children just to up her foodstamps so she can buy more crack as well as spying on your ex, you are not minding your own business.
You are being vindictive and petty and will be wasting more of your "valubale tax dollar" by starting an unecessary investigation, which, by the time they complete, he will probably be old enough to collect SSI.