The thing is, there seems to have never been a Holy Grail War in this timeline. The three houses never got together to start it. The Einzbern seem to have been working on things alone. The way they got things is likely the same, but the timing and reasoning is different. Going on Kuro's memory and Iris's story, Illya is basically 11 years old and the Holy Grail was sealed in her when she was eight months old, which was ten years ago in the story. Kiritsugu has basically been working to destroy the rest of the Einzbern to keep Illya safe. Iris and Illya's caretakers are still what they have always been, but they are free of the Einzbern family.
Of the other two familes we've only really seen Rin, though Sakura exists. The other familes seem to have not been able to make a Holy Grail War. Though the summoning cards had to come from someplace. Possibly from another dimention.
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