I have two problems and really need help

Ok so first My little sister the one after me. came out to me and told me she is bi and I'm like ok cool. But the thing that is freaking me out is that she wants to tell the rest of the fam and like i give her kudos for that but the thing is everything she does the fam says it's because of me. And I really don't want to get in the mix but As the only one in my fam who's openly lesbian I feel I should be there to support her. well I need advice on how to be her support and not have the fam put it all on me.1

The second problem I have is that my baby sister who's eight out of the blue asked me and I quote 'Lisa why are you still gay?' unquote. This threw me for a loop because she's known since she was six or seven and was always fine with me being a lesbian and me dating other girls. So I asked her where she got that question from and she's like my brain told me so and it tells me that being gay is nasty. And this really hurts me because i've watched over her from birth and now she thinks I'm 'nasty'. I want to explain to her what it means to like someone of the same sex but at the same time not influence her in anyway. Can anyone tell me how? PLease and thank you so very much.