I was reading on hse website that a family member working with you
you dont need employers liability.
??
If they are working FOR (be it employed by you, or on a sub contractor basis) your company then they need to be covered by your insurance.
If they are working for themselves (under their own company/name) then their own PL insurance is fine.
So if you GIVE them work to do for their company then you dont need to do anything (better advise your customers first someone else is doing the work), but if they are working under your name you need to get insurance for them.
Oh, and in any case - check with your insurance company if you are unsure.