I remember reading a memoir by someone —a Greco-american -—whose mother had died in WW2 in Greece. When he was a small boy the villagers made him drink wine or something from her skull.
Odd, though; 14,000 years ago? That was during the Ice Age.
It was possibly a funeral ritual, not cannibalism.
Sucking marrow from the Jaw bone a funeral ritual? Sounds like dinner.