Board Thread:Questions and Answers/@comment-39545992-20200220145354/@comment-45042910-20200220163718

Because that Flash is a part of both timelines (even prior to coming back) and only had kids in New Earth. But they existed on a Dark Multiverse world which are made out of fears.

Still you can't have people from other timelines or another world be called kids of a character. I believe the Dark Multiverse Iris and Jay must be removed as Linda Page's children.

Linda only "remembers" them after they come back, confusing concept but I guess it's like Superman Reborn where memories of both timelines merge for characters. Though in that case, characters from both timelines merged too unlike Linda.