Bobbi Kristina will be taken off life support tomorrow ... on the 3rd anniversary of Whitney Houston's death. Brown family sources told TMZ that Bobby has finally made the decision, realizing there is no hope for his 21-year-old daughter to recover.

Cissy Houston, Whitney's mom, also wanted life support pulled on the anniversary to "bond mother and daughter for eternity." We have not confirmed this, but the NY Post ran the story this AM. Members of the Brown family are extremely emotional, sobbing over the decision but realizing it's the right thing to do.

Police have launched a criminal investigation because Bobbi Kristina had injuries on her body when she was rushed to the hospital and the target of the investigation is her boyfriend, Nick Gordon.