Now sources close to Jackson say the Thriller star asked Culkin for the donation to help him complete his "perfect" family.
The source added: "This isn't just chitter-chatter, even Culkin suspects he's Blanket's father. So many names have been mentioned as prospective dads, and this is probably the wackiest yet.
But Jackson and Culkin were best friends. He was one of the few people Jackson really trusted and Mack never let him down. Really, Jackson idolised him - that's why he asked Mack to donate sperm. Deep down, I think he always wished Mack was his son. Creating Blanket was the next best thing."
Culkin - godfather to Jacko's other two children - has told pals he will not comment in public out of loyalty to his late pal.
The Michael Jackson story just got a whole lot weirder. So one question is put to rest but now we have a new question. When was the sperm donated? Please let it be after 1999 and Jackson was not in the room. Culkin, who is godfather to two of Michael's children, has yet to comment on death of Michael Jackson. And of course, he wouldn't comment on this latest crazy mess. Click on pictures to enlarge.