However, the most famous member of the Jackson clan -- Michael -- was nowhere to be seen, the BBC reported Saturday.
Jermaine Jackson told the BBC the California child-molestation trial tore his brother "apart mentally" and "he needs his rest right now."
The rest of the Jackson family -- including sisters Janet and La Toya -- were on hand for the bash, joined by a number of fans dressed like Michael.
Michael Jackson, meanwhile, posted birthday greetings to his father on his Web site.
He has not been seen in public since he was acquitted in the California case.