She might be your sister...
Son: Dad! I think I am in love with Sarah, our neighbors daughter. I want to ask her to be my girlfriend.
Father: I'm sorry son but this might not be possible. Sarah might be your sister. Please don't tell your mom.
Later,
Son: Dad! Dad! I met an new girl and I think I love her. She is Jane, our other neighbors daughter.
Father: I'm sorry son but Jane might be also your sister. Don't tell your mom.
*This happened several times and finally the son goes to his mother in anger*
Son: Mom! Mom! I've fallen in love with many girls from the neighborhood, but dad keeps telling me they might be my sisters.
Mom: Don't worry son, you can date any of them. He is not your father.
Father: I'm sorry son but this might not be possible. Sarah might be your sister. Please don't tell your mom.
Later,
Son: Dad! Dad! I met an new girl and I think I love her. She is Jane, our other neighbors daughter.
Father: I'm sorry son but Jane might be also your sister. Don't tell your mom.
*This happened several times and finally the son goes to his mother in anger*
Son: Mom! Mom! I've fallen in love with many girls from the neighborhood, but dad keeps telling me they might be my sisters.
Mom: Don't worry son, you can date any of them. He is not your father.
