should i take my boyfriend camping without his little sis?

[yiz]

well see im going camping with my family and wanted to bring my boyfriend (which my parents like) but the problem is that he has a little sister that is also my friend but my parents dont like her very much. so should i invite my boyfriend without his little sis or just not invite him at all cuz i dont think its fair to invite 1 without the other cuz then i dont think that his little sis would like me any more if i did so WHAT SHOULD I DO!!!!!!! please help if you can