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Bobbi Kristina Brown’s anguished relatives have agreed to take her off life support — but want to wait until Wednesday so she can die on the same date as her tragic mom, Whitney Houston, sources told The Post.

Bobbi’s grandmother Cissy Houston floated the idea of a Feb. 11 death over the weekend during discussions with the Brown family at Emory University Hospital in Atlanta.

The Browns gave their blessing to pull the plug at the stroke of midnight to align the date with the 2012 passing of the legendary singer at the Beverly Hilton Hotel.

The move is a symbolic way to keep the mother and daughter together for eternity, according to a Brown family source.

Bobbi Kristina, 21, the only child of Houston and singer Bobby Brown, has been in a medically induced coma since she was found unresponsive in a bathtub in her Roswell, Georgia, home Jan. 31.

The Brown and Houston families have been bickering since Bobbi Kristina was rushed to the hospital, but they have now come to grips with the fact that she cannot be saved, the source said.

“This is the only thing they can agree on — that she’s gone [brain-dead], and there’s nothing more than can be done for her,” the source said.

The agonizing choice to finally pull the plug on the young woman was made by both sides, the source said.

Filmmaker Tyler Perry, who was close to Whitney, played a key role in brokering an uneasy peace between the families, the source added.

He has already been tabbed to make all the funeral arrangements, the source said.

“You wouldn’t think of him as being someone who’d be a peacemaker, but he’s someone both sides really respect,” the Brown source said.

Perry also has been joined in Bobbi Kristina’s room at Emory University Hospital by record producer Jermaine Dupri and rapper Bow Wow, who are friends with both families and who have helped him calm things down, the source said.

“They’re respected, and both sides know they don’t want to embarrass themselves in front of them,” the source said of the men.

Cops in Roswell are still probing what led up to Bobbi Kristina being found facedown in the bathtub of her home.

She was discovered by Nick Gordon, the man Bobbi Kristina referred to as her husband, and another friend who called 911.

The police probe is focusing on Gordon, who has a history of domestic violence, law enforcement sources have told TMZ. Authorities also are investigating drugs found in the home.

When Bobbi Kristina was found, she had injuries to her face, including her mouth, CNN reported Monday, and cops want to know if she and Gordon fought before she was found in the tub.

A Roswell police rep would only say Monday that the investigation is continuing.

Reps for both families did not return calls for comment.

Top photo credit: WireImage

Additional reporting by David K. Li