Alex & Eldora McCreight of Philadelphia

Does anyone have information on the above named individuals from the Philadelphia area in the early 1900's? Just found out that my grandfather, Louis Quigley, was their illegitimate son. He was raised by foster parents Edward & Mary Quigley until the age of 5 when he was taken away because Edward was deceased and Mary Jane went to prison. They attempted to give him back to Alex & Eldora but they were determined to be unfit guardians for him, so he wound up in an orphanage.

Any help would be greatly appreciated. Not sure how old Alex & Eldora were when he was born in Feb 1906.