Police have polygraphed family members of the two toddler siblings who disappeared from their rural home in eastern Canada on May 1.
Jack Sullivan, 4, and his sister Lily, 6, were reported missing by their mother, Malehya Brooks-Murray, a day later.
Over the four months they have been gone, the local police have received more than 760 tips from the public, none of which have gotten them any closer to finding the children.
