I'm from 很强的双眼皮基因家族 too，老公单眼皮. My son's eyes look like half mother, half father. his eye lids look like 单眼皮 but there is one layer inside (Nei 双). And his eye hair is half short, half long too. when he cries he looks like father and when he opens his eyes wide he looks like mother.
It's so funny how the genes play with babie.