Things aren’t looking good for Charlie Sheen and Brooke Mueller. As Brooke’s 911 tapes reveal new information about their Christmas Day blowout, sources are saying their fight was sparked by a very unusual source: Sam, Charlie’s 5-year-old daughter with Denise Richards.

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A source told E! Online that Charlie told his wife about a song he and his daughter have that has something to do with a gift he bought Sam. According to the source, Brooke wasn’t pleased to hear about this.

“Charlie says she is really jealous of his daughters, especially after he and Denise finally started getting along," the source said.

The source added that other problems may have led to the fight, such as Brooke’s suspicions about Charlie’s past.

“Obviously the fight wasn't just about the song,” the source added. “Nothing excuses what Charlie may have done, but there's more there.”

After hearing the tape of the 911 call Brooke made from Aspen on Christmas Day, it is not surprising to learn the couple may struggle with other issues. Brooke told the 911 operator that Charlie threatened her with a knife.

"My husband had me with a knife,” Brooke said. “I was scared for my life and he threatened me."

Brooke continued, telling the operator that she wanted to be sure her complaint is logged as soon as possible.

“I have people here,” Brooke said. “My family is here, but if I don't file this right now … he's in the other room. He is with somebody but he's trying to leave.”

Charlie returned to Los Angeles after posting bond on Friday, while his wife stayed in Aspen with their 9-month-old twins, Bob and Max. (E! Online, People)

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