Sean Moorehead, the only thing I can say with some confidence is that he was born between October of 1949 and January of 1950. So he would be 71.
The second thing I can tell you is that he was a redhead. Every newspaper that mentions him states that he was a "firetop" like Agnes and Robert Gist. In fact in the March 12th, 1953 edition of The Redlands Daily Fact it plainly says that Sean was a redhead. But every color picture of the boy shows him clearly with dark brown hair.
Agnes said much later in life in an interview that Sean was not adopted but rather she was a foster mother because she was single and they didn't allow single women to adopt.
"Do you have any children?"
"My foster son Sean."
"How did you find him? How old was he then?"
"He was a year and a half old. My doctor told me about him...He was a legitimate child with about 14 brothers and sisters. His mother had put six of them up for adoption. Sean was very anemic, his little eyes were crossed, he had bad teeth and a spot on his lung."
"A foster son....You didn't think of adopting him?"
"I couldn't. I was single at the time and single women then weren't permitted to adopt babies. But I took him into my home and raised him as my own son. He's grown now and has gone out somewhere on his own."
"You don't know where he is now?"
"No, I haven't heard from him in quite a while." There is no emotion in the things she says. Now, quite suddenly, she flashes a most unexpected and radiant smile. "But that's all right. That's the way boys are."
Agnes wasn't even remotely single when she "fostered" Sean she was indeed married to Jack Lee and still very much a Mrs. Some newspapers place the adoption in January of 1952:
Mansfield News / Mansfield Ohio / January 18th, 1952
Agnes Moorehead now has the final adoption papers on her two year old son.
January 23, 1952
Final adoption papers have been given to Agnes Moorehead for the two year old boy she has been caring for so he is now completely hers.
Will we ever find out the myth behind Sean. I know he was a troubled boy. He robbed Agnes on at least two occasions. He insisted that his friends call him Eric, perhaps his real name.
He ran away from at least one prestigious English boarding school. He simply walked out of Agnes' life without so much as a by your leave.
He would have known, just as anyone who picked up a newspaper knew, that she was being treated in the Mayo clinic in 1972 first as an inpatient and then as an outpatient. Generally signifies a serious illness and/or surgery when that happens and still he chose not to get in touch with her and she made no attempt to find him.
After he left Agnes' home he went to Switzerland where he lived under the roof of Paulette Goddard.
After he leaves the home of Paulette Goddard Sean became another face in the crowd or did he. No one ever heard from him again. Could he have been murdered and Agnes was covering up?