Should i report my sister in law for benefit fraud?

My sister in law is committing benefit in two ways: Shes working and not declaring it and living with her partner. This has been going on for roughly 2 years now. I struggle to pay my bills and i don't see why she should be allowed to get away with it. However i very concerned about it coming back to me with... show more My sister in law is committing benefit in two ways: Shes working and not declaring it and living with her partner. This has been going on for roughly 2 years now.
I struggle to pay my bills and i don't see why she should be allowed to get away with it. However i very concerned about it coming back to me with being a family member and also how confidential the helpline is and could it be track back to my computer if i did it online.
I have all the relevant details apart from her NI number.
Im in a rutt about what I should do.
Your comments would be appreciated thank you
Update: I'm certainly not jealous, just dont like the fact that shes doing it.
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