I have always thought this one easy but people seem to have trouble with it. Lets see what you think.

A man tries to walk into a patient's room, the nurse in the room stops him and says that only relatives are allowed in. She asks him if he is related to the man lying in the bed. In response he says

Brothers and sisters I have none

but this man's father is my father's son

How is the man related to the patient...

The End

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