Nick Gordon threatened Bobbi Kristina's close family members as he tried to get a greater share of Whitney Houston's wealth, they claimed last year
Houston's sister-in-law Pat Houston told police she was repeatedly threatened after she refused to increase Bobbi's monthly allowance
But police said they did not find evidence of violent threats
Bobbi Kristina, 21, is fighting for her life at Emory University Hospital after being found face-down in a bathtub at her home on Saturday
