Paris Jackson's family is reportedly "worried sick" about the 17 year old following her recent break up with boyfriend Chester Castellaw. "Paris is causing great concern for her family. Ever since her breakup with Chester, she has become quite rebellious," a "family insider" told Radar Online. "They are starting to go through the same thing with her that they went through with Prince last year. She is staying out past curfew, hanging out with a group of people that seem to be misfits, and she is not listening to much that her grandparents Katherine and Joe say," the source added. It's unclear why Jackson and Castlellaw split, and it had been rumored that they had been engaged. The King Of Pop's daughter has not revealed the cause of the break up to her guardians, grandmother Katherine, 85, or TJ Jackson, 37. The insider said: "She hasn’t opened up to practically anyone about why she and Chester broke up." One of the reasons the family is concerned is because Paris had a breakdown two years ago that resulted in her admittance to a psychiatric facility for nearly a year. In addition, she turns 18 in a few months and will inherit a large fortune from her father Michael Jackson's estate. What will she do with all that money? The source said: "She said that she cannot wait until her birthday. The first thing that she wants to do is get her own place." If she moves out, it will be more difficult for the family to keep an eye on her. An 18-year-old girl with a dispensable income could cause a bit of trouble. What do you think -- does her family have a reason to be concerned or is Paris just acting like a normal teenager with a broken heart?