(CNN) A Pennsylvania woman and her teenage daughter are charged with killing five members of their own family who, the mother later told police, all "wanted to die," according to a probable cause affidavit.

Shana S. Decree, 45, and her daughter, Dominique K. Decree, 19, are accused in Bucks County of killing their relatives, including three children, at their apartment in Morrisville, north of Philadelphia.

In separate interviews with police, the women said they and Shana Decree's sister choked the others to death before Dominique Decree fatally choked the sister, the affidavit says. Dominique Decree's neck had visible injuries, police observed.

"Shana advised that all, including the children, were talking about suicide," the affidavit says.

The women both have been charged with five counts of homicide and one count of conspiracy, the Bucks County District Attorney's Office said

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