If you knew someone was committing fraud, would you report it?

We have this thing called Centrelink in Australia, which is a government service that gives benefits to people in need.

So my cousin who is married to a man with a well paying job and has two kids, her most recent is 5 months old. Is currently claiming to Centrelink that she’s a single mother and getting a lot of money a fortnight(I know that it’s over $1000) Usually I just ignore this sort of stuff. But they are going on expensive trips every few months, goes out to eat at nice restaurants once a fortnight and just brought a house. Maybe it’s just because I don’t like her as a person, that I want to report it.

I would to know what CC thinks about this stuff? What would you do in my situation? And would it be horrible of me to report it?

Edited to add, she’s also getting maternity leave payments.