I don't see how it could.
The only way that your FICO scores (you have three) would be impacted is if a lender reported to the credit bureaus that they had extended you credit. Presumably your relatives aren't going to suddenly sign contracts with the CRA's and report your "account."
I may have missed something here (wouldn't be the first time), but I think you're good.
* Credit is a wonderful servant, but a terrible master. * Who's the boss --you or your credit?
FICO's: EQ 781 - TU 793 - EX 779 (from PSECU) - Done credit hunting; having fun with credit gardening. - EQ 590 on 5/14/2007