Board Thread:Speculation House/@comment-27404492-20170417075739/@comment-26397825-20170501021406

LucasVerBeek wrote: The Time Travel in Cursed Child directly contrasts with what was already set in the universal lore. How? The fact that they actually created alternate timelines?

The only time we've seen time trave in Harry Potter is the third book, which JK never stated either way what actually happened the first time Harry lived it, so as far as we know he didn't change anything at all.

Really, the only problems the story has is as you pointed out, the lack of Teddy Lupin (did he literally not exist or was he simply never mentioned, in which case he'd be 19 and off studying for whatever job he wanted at the start of the Crused Child), and the rumour about Scorpius being Voldemorts child (the Cursed Child starts 19 years after the Final Battle and Scorpius is 11, meaning there's 8 unaccounted for years, plus an easy paternity test would disprove any rumurs).

Even Delphi's birth is explainable (here's an article where a reddit user actually sat down and worked it out ). As for why she was born...why not? Voldemort could have wanted an apprentice, someone to teach to be his almost-equal (not equal or superior because Voldemot is obviously always superior), or hell, he could have just wanted to make sure that if there was even the slightest chance of him dying, at least the Slytherin bloodline wouldn't die out. He was crazy, but he was brilliant as a teen. Some of that had to remain, right? But it didn't turned out quite right because they wanted a son, and they got a daughter instead.