WHY DID FATHER CHRISMAS HAVE TO GO TO HOSPITAL RIDDLES WITH ANSWERS TO SOLVE - PUZZLES & BRAIN TEASERS

One of the 'fathers' is also a grandfather. Therefore the other father is both a son and a father to the grandson.

In other words, the one father is both a son and a father. Did you answer this riddle correctly?
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Nothing. Did you answer this riddle correctly?
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They were two of triplets Did you answer this riddle correctly?
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Slow swimmers! Did you answer this riddle correctly?
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Your mother. Did you answer this riddle correctly?
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Anywhere it wants! Did you answer this riddle correctly?
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In case he got a hole in one! Did you answer this riddle correctly?
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Joshua, the son of Nun. Did you answer this riddle correctly?
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Take the goose over first and come back. Then take the fox over and bring the goose back. Now take the corn over and come back alone to get the goose. Take the goose over and the job is done! Did you answer this riddle correctly?
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First, he takes over the goat. Then, he takes over the cabbage, but takes the goat back. Then, he takes over the wolf. Finally, he takes over the goat again. Did you answer this riddle correctly?
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Thorium. Did you answer this riddle correctly?
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Mercury Did you answer this riddle correctly?
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Silver Did you answer this riddle correctly?
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A rainbow Did you answer this riddle correctly?
YES  NO  

A civil serpent! Did you answer this riddle correctly?
YES  NO