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Generally Wikidata would definitely be the way to go here, though I just now tried to retrace your graph in Wikidata and it seems to be missing at least one relation (Ada of Holland has no children listed -- https://www.wikidata.org/wiki/Q16156475).

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I am doubtful. I tried for a long time to use it to get data or for my taxonomic graph project (https://relatedhow.kodare.com/) and SPARCQL was just not usable at all. The biggest problem was the 60s time limit. Totally not workable for what I wanted. I also had issues with seemingly inconsistent results, but it was hard to tell.

I ended up loading the full nightly db dump and filtering it streaming from the zip instead. Faster and it actually worked.

The code to do that is at https://github.com/boxed/relatedhow

There's an alternate Wikidata query engine available here: https://qlever.cs.uni-freiburg.de/wikidata (from https://github.com/ad-freiburg/QLever)

Currently it doesn't support some SPARQL features, but I've found it to generally be quite a bit faster for most queries.

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