A source close to Michael Jackson tells Usmagazine.com the family has not yet reached out to Debbie Rowe, the mother of his two oldest children.

"Even now, she just wants to visit them and be a part of their lives -- she's not after custody unless they were being harmed," the source tells Us.

Jackson's mother, Katherine, was granted temporary custody of Prince, 12, Paris, 11, and Prince Michael II (Blanket), 7. Dad Joe has said the kids "belong" with Michael's parents.

Rowe's lawyer, Eric George, told the Los Angeles Times he would attend a Monday custody hearing to represent Rowe, but said he didn't know if she would ask for custody or to continue visitation rights.

Rowe filed a petition in 2001 to give up her parental rights, but went back to court to regain custody in 2003 -- after Jackson was accused of child molestation. But Rowe -- who was wed to Jackson from 1996 to 1999 -- has said: "I didn't have the kids to be a mother."

On Wednesday, a 7-year-old will was filed in court. Jackson wrote that he "intentionally" cut out Rowe. The new issue of Us Weekly exclusively revealed dermatologist Arnold Klein is the biological father of Paris and Prince.

"He and Debbie signed an agreement saying they would never reveal the truth," an insider told Us.