A teenager has told authorities that her mother killed two of her siblings and forced her to put one of their bodies in the freezer at their Michigan home.

In a court filing, child welfare workers said Mitchelle Blair's 17-year-old surviving daughter told them Blair tortured her nine-year-old brother, Stephen Berry, for about two weeks before he died in August 2012.

They say she told them her mother strangled her 13-year-old sister, Stoni Blair, in May 2013 after becoming enraged because Stoni said she did not like her siblings.

The daughter said her mother made her put Stoni's body in the freezer.

All of the children were severely abused.

Court officers discovered Stephen snd Stoni's bodies in the freezer while serving an eviction notice on Blair, 35, on Tuesday.

Blair, of Detroit, has appeared in court on child abuse counts, but could eventually face murder charges.

Post-mortem examinations are scheduled on the bodies of the two children.

Authorities hope the bodies have thawed enough by today to allow the medical examiner's office to determine how they died.