Jerod posted the music video "Pray for BK" for the 22-year-old daughter of Bobby Brown and late singer Whitney Houston, reported People magazine.
Jerod penned the lyrics himself in the Shawn King-directed clip.
"I never thought that it would come to this/ Speaking on behalf of my cousin Kris," he raps, wearing a "#PRAYFORBK" white T-shirt in the three-minute video.
"While she's alive/ I'm praying to the skies/ and for that I don't need your permission," he continues.
Bobbi Kristina's aunt Leolah Brown took to Facebook to show her support for Jerod's tribute.
Bobbi Kristina has been hospitalised for almost two months after being found unresponsive in the bathtub in her home.