My BIL and his GF had a baby in June. Over Christmas, we learned that my BIL didn't go on the birth cert and that they never told the GF's case worker that she is living with him because he has a good job and good insurance and if they told the case worker that, she would lose her food stamps and medicaid. My BIL can afford to buy food but his thinking is, " If I can get it for free, I'm taking it." He is scum, really, and not just because of that, because of other things. He's sneaky and if he's at your house and your purse is out, he will go through it and steal money, even though he makes twenty dollars an hour. ( in our area, that's good money).
As far as welfare is concerned, the GF is a single mom who doesn't know who her baby's dad is and still lives at home with her mother ( who also collects welfare and has all of the GF's life. BIL and GF live next door to her mother.) Because of the addition of the baby, the mother's welfare income went up as well so she doesn't want them to tell anyone what they are doing.
So would you turn them in? They are committing a crime and can afford their own shit. My husband is disgusted by his brother.