The Lore of Inter-breeding

[Cleretic]

As I recall, the rules are the child will always be of the mother's race, but with minor cosmetic features of the father's race, so as to avoid problems like roe x lala romance and children

Again, as argued in the two pages before this, in every post since this thread was revived: literally never a rule. All the mixed-race characters we'd met across the first few years of the game (Arenvald and Hilda most prominently, although Arenvald didn't have visible Garlean features) did fit this trend, but it was never a rule and was never stated, only inferred, it turns out wrongly. It was proven wrong most prominently with Severa.