Killing two children can never be planned Steve. It just didn't happen that way. They were killed out of love for them not hate. They died together with their mother which Sheila had wanted that way and not left to the mercy of the world, orphaned and unloved. In Sheila's mind she saw a better place.
But Sheila had never accomplished anything of worth apart from those two boys, and they were her bridge to Colin, they brought her respect and her relationship with June was slowly healing with the quarterly allowance about to be put in place. One talent Jeremy did have was reckoning money: money for the Maida Vale flat, money for hospital bills, money for food parcels and money for a private education for the boys. This was his chance with all occupants under one roof to maximize his inheritance and like Brutus in
Julius Caesar take the tide at the flood.