Is my sister committing benefit fraud?

My sister has an 18 month child, no job and lives with the father of the child (who earns in excess of £40000) in his house. They are not married. He doesn't give her any money and my mum often pays for busfares etc for my sister... What would she be entitled to claim in the UK? She is getting some... show more My sister has an 18 month child, no job and lives with the father of the child (who earns in excess of £40000) in his house. They are not married.

He doesn't give her any money and my mum often pays for busfares etc for my sister...

What would she be entitled to claim in the UK?

She is getting some benefits and i don't know if it is fraud... i don't want her getting in trouble.
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