ok, you guys might not believe this because theres so many weird coincidences, but its true. I live in a small town and was briefly dating this girl named kelsey. her mom is also named kelsey!! (weird, I know) my dad lives across town and I dont talk to him very often... one night he started dating the mom (milf BTW) and me and the young kelsey didnt know! nor did the parents know me and the young kelsey were seeing each other, very weird coincidence, almost hard to believe. we did eventually find out though, had quite the laugh over it. theyre not together anymore nor am I. but I was just wondering... what IF, my dad and her mom got married... that would make the young kelsey, who I was currently dating, my step-sister wouldnt it? so I would basically be dating my setp sister?!? even though we were together first... so how does that work?