Mae Young's son is the son of Mae Young. He is a caucasian hand. She gave birth to him in the year 2000. Mae Young was born in 1923, making her 77 when she gave birth. She was the girlfriend of Mark Henry (who was 29) and he is attributed to be the father. So this hand may very well be Mark Henry's son as well.
He debuted all grown up (at 12 years old) on Raw 1000 in 2012, bringing his mother to the celebration. AJ Lee and Layla El both saw him. It appears that being only a hand accelerates the aging process, as he had grown a human face (wearing glasses) and appeared to be an adult.