Curly haired parents - straight haired child

[Airfriedshite]

Just read another thread (well a bit of one) where family were dark haired and 1 person blonde it reminded me. I am sure I read somewhere if both parents have curly hair the child will have curly hair not straight is this bs or correct??

My children all have curly hair but the boys only got curly when they went through puberty.Their hair then became a mass of curls and has stayed that way.

I’d assume at least one child would be curly.
My dad has Afro caribbean hair and my mum has softer curly hair.
My sisters hair is wavy but thick, my hair is 3b curly (Nicole Kidman Days of Thunder curly) and my brothers was thick but lost it’s curl once my mum cut it.

My DS1 had a Fro-hawk as we called it, super curly like me but the curls went as soon as I cut it and it’s now exactly like my brothers was, thick and grows straight up.

DS2 had softer curls but it stays mainly straight unless it’s wet.

My oh and I have very curly hair, my dd has the straightest, sleekest hair I have ever seen. She can get out of the bath at night with it soaking wet and fall asleep without brushing and drying it, guaranteed the next morning she’ll wake up and it will be shiny and perfectly straight. The annoying thing is how little she appreciates it, she wishes it was curly

I’m massively simplifying but it’s entirely possible for two curly parents to have straight haired children.

Everyone has two copies of each gene, one inherited from each parent. “Curly”is a dominant gene, which means a curly haired person can either be CC (two curly genes aka homozygous) or Cs (one curly gene and one straight aka heterozygous).

If two Cs people have children there’s a 1 in 4 chance they’ll both pass on the ‘s’ gene and have a straight haired child. The odds are the same each time so they could in theory have several straight haired children! But if they had a massive family it would roughly work out:

1/4 CC - two curly genes = curly hair
1/4 Cs - curly from dad, straight from mum = curly hair
1/4 sC - straight from dad, curly from mum = curly hair
1/4 ss- straight from both = straight hair

So if they had 20 kids about 15 would be curly and 5 straight.