Michael Jackson's big sister, Rebbie, has always been keeping a low public profile, but she's been playing a big role in caring for Michael's three kids since his passing away.

If Katherine Jackson ends up getting custody of Prince, Paris and Blanket, Rebbie will be the one caring for them and raising them.
One has to keep in mind that their grandma is 79 and it's difficult for her to care for three active kids.
Rebbie is very much involved in the kids' lives and they love and adore her.
According to TMZ, Rebbie is currently living with Katherine at the Jackson's Encino home and is taking care of the kids day in and day out.

Rebbie, who is 59, has been married to her childhood sweet heart since 1968, they have three children and live in Las Vegas.