Not red, but reddish.
His eyebrows are gold, his eyelashes are clear like Steve’s.
Around his temple it’s pretty orange, and on the back of his head it’s brown.
Though Jack was born with light brown hair and then it fell out, like most baby hair does, and in its place grew in the whitest blond.
And it’s hard in photographs to gauge his hair color because the lights in our house turn everything a little more gold, but when I go into the color settings and add more blue for accuracy, his skin starts to look sickly pale.
So he has to be seen in person, that’s the point.