My gf's kid sister keeps hitting on me. I don't want to cause a problem in the family so I haven't told my gf yet. I'm not sure what to say. I'd like to shut this down before things go south. Should I sit them both down together? That's what my friends are saying but it doesn't feel right.

First, talk to your gf. You don't know what other issues are involved between the two of them. She may want to handle it herself or she may want to have both of you sit down with her sis. Talk it out.

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