A strange scenario

This is pretty strange but I look so much like my aunt who is not related to me by blood. My dad's brother(my uncle), married my aunt who is not related to me by blood in anyway. I once had an opportunity to take picture with my aunt and my mom and the outcome is terrifying. I look like an younger version of my aunt. Lately i have been thinking about it and you know what is even stranger? When i was in kindergarten my dad used to joke around me saying, "You are not our child. We got you from someone else." My mom said few times, she didn't want to have a second child but ended up having me. My mom also said she never breast fed me and my another aunt breast fed me.

When i put all the scenarios together it creeps me out.