Cissy Houston, mother of the late Whitney Houston, is allegedly very upset that her granddaughter Bobbi Kristina Brown has struck up a romantic relationship with her adopted "brudder" Nick Gordon.

"What they're doing is incestuous," Houston reportedly told a close friend after seeing the video above, which features the new couple embracing and kissing.

The iconic singer never formally adopted Gordon, but he was considered a part of the family, and was often referred to as a son and brother by the Houstons.

Brown's grandmother supposedly believes that Brown has problems, and Gordon is taking advantage of the situation.

A source reports that Houston is so concerned that she may be trying to get him evicted from Whitney's home, where he lives with Brown.

[TMZ]