My great-great-grandmother was Blackfoot, but that isn't enough for me to check the "Native American" box.
My husband also had a great, great, grandmother who was native American married to a French Canadian trapper. She may have been Cree. He grew up in Iowa, and his mother never told him until a few years before he died. She was ashamed. I probably have a little Mongolian Tartar from my Prussian German ancestry. Our one son is very dark haired, dark eyed and slightly olive skinned. He was at a museum once and said he really thought he looked a lot like the Crees. Our other son has medium brown hair, very dark eyes, high cheekbones, and somewhat almond eyes. He had a slight epicantic fold as a baby. He is also dyslexic like his father. Now, in a recent thread I discover that my husband may also have Neanderthal ancestry, with his bright red hair, freckles, clear blue eyes, hairy body, short legs, long strong torso, big bones, heavy brow ridges, warrior temperment, and Scots ancestry. I wonder what his mother would have thought of that? Isn't genetics fun, can't wait for the new scientific developments.
Regarding dolicocephalic heads, there is an interesting nutrition factor. Head shape can be influenced by nutrition factors, Adelle Davis, "Let's Have Healthy Children". When number 1 son was a baby he had a broad full head. After age 1 his head began to narrow like mine, but not his red head father. Then I read in the book that this is a sign of Vitamin D deficiency. I started giving him cod liver oil and his head gradually became rounder again. Vitamin D is formed by sun in oils on the skin, then absorbed into the body where it affects bone formation. If it was more cloudy in the period around 13kya, or if more clothes were worn the fact that more skulls were dolicocephalic may not have been racial, but environmental. I believe that in ice age times it was drier (less cloudy) people might have been less likely to wash the skin oils off in the cold, ergo, brachycephaly.
My great-great-grandmother was Blackfoot, but that isn't enough for me to check the "Native American" box.
I scalded my feet once.