Doing a little math, I'm thinking he had to be 15 or 16 when the child was conceived. Not entirely unheard of, but most likely not the type of situation where he ended up in the typical father role.
Edited to add: Doesn't Darren McPhadden have a load of illegitimate kids? If a lot of them are boys, then there will be an influx of RB talent on the D-1 level in about 15 years.