Whitney Houston's mother has reached out to the tragic singer's daughter in a heartfelt open letter, urging the 20 year old to rethink her marriage plans. Cissy Houston and Bobbi Kristina Brown fell out after the gospel singer wrote a book about her daughter, which her granddaughter called "disrespectful" - and now they rarely speak. Cissy is now trying to mend her relationship with Brown by offering her relationship advice in the form of a letter she has released to media outlets. In the statement, grandma hopes the 20 year old will one day read her book, Remembering Whitney, and "understand that I just wanted to let the world see some of My Nippy". But she also risks pushing her granddaughter further away by addressing her engagement to Nick Gordon, which Bobbi Kristina confirmed in July (13). Cissy writes, "Krissi, all I want for you is your good health and your happiness. Do I want you to get married in the near future? No, I don't. I think you're too young and I wish you'd wait. But that's because I'm Grandma. I'm supposed to worry about you. I'm supposed to wonder if Nick or ANY man is good enough for you. My Baby's Baby."