KAMLOOPS, B.C. — A mother is expected to describe Tuesday the unimaginable horror of coming home to find her three children dead.

Darcie Clark will testify at the first-degree murder trial of Allan Schoenborn, the children’s father.

He is accused of killing five-year-old Cordon Schoenborn, his eight-year-old brother Max and their 10-year-old sister Kaitlynne in April 2008 in the Merritt, B.C., trailer home.

The B.C. Supreme Court trial, by judge alone, has already heard many heart-wrenching details, including video evidence taken of the crime scene.

Not far from the front entrance of the home, the boys were found lying on the living room couch as if asleep.

The TV was on and Max’s arm was wrapped protectively over his little brother’s chest.

On the wall nearby a message in large block letters read “Forever young” was written in soya sauce.

The court heard that both boys were either smothered or suffocated.

Down the blood-spattered hallway in Kaitlynne’s room, Clarke’s daughter was wrapped in a blanket hiding the stab wounds that killed the Grade 4 student.

In the master bedroom were more messages, this time written in blood on a pillow case reading “gone to Neverland” and “forevr young.”