Houston's daughter accused of incest by grandmother

Whitney Houston's daughter Bobbi Kristina has been accused of conducting an incestuous relationship with the star's ‘secret son’.

The accuser is none other than Cissy Houston, mother of the world famous singer who died last month in Los Angeles on the eve of the Grammy awards show.

Bobbi Kristina's grandmother's comments were reported on celebrity website TMZ.com after reports that her granddaughter, 19, was in a relationship with Nick Gordon, 22.

Whitney Houston took in Gordon at the age of 12, and considered him her son, even though she never formally adopted him and the two are not blood relations.

Photographs showed the couple kissing and embracing this week and some reports even said they were engaged.

"What they're doing is incestuous," Cissy was quoted as saying, adding that she felt that Gordon was taking advantage of the girl at a time when she is vulnerable. Cissy is also trying to get Gordon evicted from Whitney Houston's home where Bobbi Kristina also lives, the report said.

Gordon has denied there is anything improper in the relationship. "We're just close – just going through her mom's passing and grieving together," he tweeted this week.