The late star's kids Prince, 17, Paris, 16, and Blanket, 12, took a trip to the city of Gary for an intimate family celebration in honour of their father, reported TMZ online.
The occasion marked the first time the siblings have been seen together for a while as Paris has spent the past year at therapeutic boarding school Diamond Ranch Academy in Utah.
The aspiring actress became estranged from her family following her attempted suicide last June, but doctors wanted her to rekindle her bond with her grandmother Katherine Jackson and Prince and Blanket as they believed it would improve her mental health.
However, Katherine, who is a co-guardian to Michael's three children alongside TJ Jackson, doesn't think that's a very good idea and wants her to return.