I'm In Love with My Half Cousin! So a Little Advice Would Be Appreciated...

So, I'm the daughter of a man who married twice. His two children are my older half siblings and I'm the youngest. Well, my father is dying and today he told us that there's a girl in her mid 20's, my half-sister, from a relationship he had while my mother was away from the city, before they even married. Well, she's coming to the funeral, and we've been talking for a while and I really like her. She's a beautiful girl, so much my type. So, you guys know how it is, love at first sight, and I was really thrilled to learn that she's single now. I really have to see her at least once when we meet, since they're coming to the funeral. And if she stays longer, we might have the chance to explore our feelings.