Baby's chance of adhd / autism or both

My fiancé mom has adhd n his father had autism not the serious kind 
And so my fiancé had gotten both he is perfectly fine but you can tell he's different! Other than that nobody else but his younger brother only has adhd and 3 sisters perfectly fine
Do you think theirs a chance my baby will have both or either?? 
My doctor said not to worry theirs a chance he won't but I'm just curious! 

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