I have a lesbian sister, same father but different mothers. I never had to accept anything, I realised who she was. I asked her and even though she was reluctant, she did confirm her sexuality. I told her I had her back, if anyone in the family was giving her problems about her sexuality she must know she can come to me for support. I'm a feminist and I have been an LGBTI ally for years and for me it's not really a bid deal who my siblings choose to love as long as they are happy. She's my lil sis, I love her and I embrace everything about her.