According to reports on E!Online in the exclusive clip Bobbi, daughter of late singer Whitney Houston, shocks her family when she tells them of her plans to wed Nick.
During the clip Gary Houston, Whitney' brother, appears to disapprove of their bond, as he has a heated discussion with Gordon.
He says: 'No one knew that from a godson you would turn into a boyfriend. No one knew that.'
With the 22-year-old stating: 'The family has me out to be a bad person.'
And determined to make her family accept her blossoming romance, Bobbi firmly asserts: 'They want to see us fail. We won't.'
Bobbi and Nick lived together as siblings for more than a decade before Whitney's death in February, with Nick considered to be the superstar's unofficial adopted son.
She took him into her home when he was just 12 after his father went to prison and his mother was unable to take care of him.
However, following Whitney's passing - having died at the age of 48 due to an accidental drowning complicated by heart disease and cocaine use - the controversial pair grew closer.
In August Bobbi Kristina Brown was given a ring by her brother-turned-boyfriend Nick Gordon.
The giant sapphire stone surrounded by diamonds which Bobbi placed on her ring finger sparked rumours of an engagement, which the couple denied claiming the ring was just a gift.
However footage taken from the 19-year-old's reality show, entitled The Houstons: On Our Own, has allegedly confirmed that she is in fact engaged to Gordon.