Bobbi Kristina will be taken off life support on the 3rd anniversary of mom's death

Bobbi Kristina will be taken off life support tomorrow ... on the 3rd anniversary of Whitney Houston's death ...TMZ has learned.

Brown family sources tell us Bobby has finally made the decision, realizing there is no hope for his 21-year-old daughter to recover.

A source connected with Houston's family told TMZ on Sunday ... Cissy Houston, Whitney's mom, wanted life support pulled on the anniversary of her daughter's death 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.