As previously reported, the relationship between the girls and Demi has reached "breaking point" after a series of fights and they have cut off all contact with her. But they are now considering going one step further.
"Rumer, Scout and Tallulah are seriously considering taking out a restraining order against Demi to stop her from contacting them," a source close to the family tells RadarOnline.com. "They made it clear to her weeks ago that they do not want to talk to her right now but she is still trying to contact them.
"Demi has been calling them incessantly and emailing them, leaving them tearful messages and begging them to call her and the girls are sick of it. It is a really drastic measure and not something they are considering lightly but they just feel like they want some peace and quiet."
As RadarOnline.com previously reported, Moore, 49, is distraught over losing contact with her three daughters.
"Demi is beside herself over the situation," a source previously told RadarOnline.com. "She hasn't spoken to Scout, Rumer or Tallulah for weeks now, they won’t return any of her calls, emails or texts.
"The girls have cut off all contact with Demi, and she is absolutely devastated by it. She has returned to work and is trying to hold herself together, but this is a really tough time for Demi."
The Willis girls wouldn't be the first celebrity spawn to legally stop a troubled parent from contacting them. Francis Bean Cobain was granted a restraining order against her mother, Courtney Love in 2009.
However, it may not be that simple for the Willis girls if they do decide to try to take out a restraining order against their mother. A legal expert tells Radar they will have to prove more than just annoying phone calls: "You can’t get a restraining order against your mom when she’s trying to call you. If that were the case, many, many more people would all be in court!!"