Subject: Can I identify which ancestor gave rise to my child's red hair?

One of my four children has red hair. The others have blonde. I am blonde and my
husband is brown. There is no known red hair in the family on either side. I am
a genealogist so have researched a good way back. The only known red-head
(although indirect)is my great great grandmother's brother. I would love to know
which line/lines the red hair has come from or even get a rough idea of when
there would have to have been an ancestor with actual red hair.

Re: Can I identify which ancestor gave rise to my child's red hair?