The genuine winning ticket, which was bought in Worcester, has never been found.
He said he killed the children because one of them would not stop crying.
A three-year-old boy was left with serious burns to his face and arm.
His three-year-old son suffered burns to his arm and face.
Thomas Jones, 18, was missing for nine days before his body was found in the River Severn.
The 20-year-old leapt from the dock and ran past astonished staff.
There will be no further details until formal identification takes place.
Thomas Jones was last seen a week ago.
18-year-old Thomas Jones had just started a teaching course at the University of Worcester.
Five others have already appeared in court, including victim's father.