@awnlee jawking
I've just been reading a story in which the 'Mary Sue' character is a 6' 3" man, his wife is 5' 4" and they have a daughter who grows up to be 5' 2".
My first thought was that in real life, the 'Mary Sue' character would be extremely unlikely to be the daughter's biological father unless she had some sort of developmental problem.
Genetics can often spur strange offspring. Things like height can come from many things, not just genetics.
My mom was 5'1", my dad 5'7". Yet I was 5'9". My late fiancee was 5', yet both our kids are 5'10"+.
And my dad was blonde, my mom had light brown hair. Yet my hair is dark brown. And 3 of my 4 grandparents come from lines that suffer from male pattern baldness, with some being bald before 40. Yet I still have a full head of hair with no thinning at 56. And neither the French and Norwegian light skin of my parents, but the darker skin tone (and hair) from her mother's side.
So it is not unusual at all. It is very common for traits to skip an entire generation or two, then pop up again generations later.