ive heard of that too, an although my boys got short straight hair, n im curly, we do have the same eyes and lips....... so that could be it as well

my hair: 3b, high porosity, high density and coarse hair (i think i finally figured that all out)
my hair loves conditioner only styling!
Oils and my own procuts are my hairs best friend
my hair goal length is bra strap length when curly.