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If your dad is happy, I don't see why you shouldn't be. I don't have the exact same situation as you, but I do have a little cousin who is 1, and her parents are the same age as my parents. Seemed a bit weird at first, but it's awesome having a little baby around. Her 2 older brothers she has (around 17 and 21) also felt weird, but as soon as she was born, they were cool with it.

I'm sure you'll love it.