Hey, miss marmelstein, it is a known fact, chronicled in the Clan of the Cave Bear series, that Broud was hittin’ on Ayla every chance he got.
Proof of the puddling was the birth of Durc who was a half-breed.
There is so much evidence for this interbreeding in the record of that series that you can’t dismiss it out of hand.
I only got to Chapter 2 in that book about thirty years ago!