I like my mums friends daughter, should I talk to her or is it too risky?

I like my mums friends daughter, should I talk to her or is it too risky and it will affect there friendship. They are friends since 15+ years and have seen me grown up also my mother saw her daughter growing up. Idk if I should talk to her or what I should do because her brother is also a very good friend of me. He has no clue I find her attractive.