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A young man wanted to marry and came to his parents. I want to marry our neighbour Olga.-Don't marry, her. She is your sister.-his father says.
-Ok, I will marry Tatyana who lives in our street,-says young man.
-No, you can't marry her, she is also your sister,-says his Father.
-Ok, I will marry Lena who lives in another street,-says young man.
-No, you can't marry her, she is also your sister,-says his Father.
-Dear son, you can marry any of them,-says his mother from the kitchen,- he is not your father.:)