The 59-year-old singer, who shares a home in Las Vegas with her hubby of over 20 years, has kept a low public profile, but privately she has been deeply involved in the lives of Michael's children.
We're told Rebbie is currently living with Katherine at the family's Encino home and is caring for the kids day-to-day. As for the kids ... they all adore her.
Although the family is divided on many issues involving Michael's estate, we're told there's no argument when it comes to Rebbie caring for the kids. Whether she eventually becomes the custodial parent in name or not, she will end up with the primary responsibility of raising Michael's three children.