User blog comment:Gmwbmw44/Why does everyone insist Lincoln's adopted?/@comment-31563773-20170718005119/@comment-25120277-20170718010447

Yes.. But it's quite possible to have inherited some traits that are from ancestors as well...

I mean... I believe my mom once said her mom had blonde hair... Yet my mom got brown...

It's highly probable it is indeed Lucy's black hair coming from Great Grandma Harriet...