Justin Morningway loved his family.
Especially his sisters Margaret and Mary.
They both died tragically, leaving behind
husbands and sons. It was those sons
that drew his attention during his grief.
He murdered Harry's father to gain
custody of him, but Sam and Dean were a
little more complicated as it was difficult to
get something of Johns with all the
protections the man kept in place.
Instead he arranged to take the boys, and
make them believe he was dead.
Harry discovered what Justin had done to
his father and in the fight that followed,
Justin was killed.