I have to say you need to look at some very personal circumstances first.
I know someone who did it even though she was with her childrens father because he was abusive & took his pay & spent it before she could buy food & pay rent etc. If she didn't claim it her children would've starved & she would've been homeless. As it was she had no car & no food as he took alot of her money too.
These are things that may or may not be happening.
I also know someone who did it, but all their extra $ went to the pokies, not the kids, so her SIL rang them.
Its a tough call to make...