My sister claims she is in love with me, am confused.

We are two children in the family and my sister is younger than me. I am 26 years old.

From when she was in Senior Three, my sister, who is now in Senior Six, has always claimed to be in love with me and keeps demanding sex, especially whenever she returns home from school for holidays. In Senior Three, she also declared that we would get married after she completed university.

I have always told her it is a taboo for us to have an intimate relationship, but she is always quick to reply that I'm not her brother. She also used to tell me that our father had declared that I would be the man to marry her.

Initially I brushed off her statement that we were not siblings and we were to get married. However, she kept repeating it until early this year when I asked why she thought we were not related.

She said her parents told her I was abandoned when I was only one year and eight or six months old.

Her parents picked me, took me to a police station where they were advised to put announcements on radio calling for my relatives to come claim me. The announcements were made, but none of my relatives came forth and the couple who had picked me, adopted me.

I talked to my mother and she confirmed I am adopted.  She showed me more evidence, which included a letter my father wrote and photos.

He also recorded a short video in which he requested me to marry the girl I have known as my sister all my life when we came of age so I would become the next of kin.

I am confused, upset, frustrated and scared to obey my father's wish, yet I'm afraid of the consequences of going against his will.

What should I do?

George William