Exactly what he is doing started with the worst first. when life evolvins spontanepously separate simultaneosuly linear sequences can only e done against it in sequence beginning to end.
Like ancestors becoming part of ancestry when born great great grandchild generation until they mature and become 1 of 2 parents to the next great great grandchild generation gap average time space about 20 years apart but since siblings can range almost 20 years apart things get blurry in minds of people dying to stay in character cradle to grave.