Not only that, the legal status of this info is murky at best and a clear case of copyright violation at worst.
I thought the Knowledge Graph was based on Freebase[1].
Re:Spoofing Google Search Results
by blattimwind on Saturday February 16, 2019 @08:13AM
(#19178419)
The text usually is from Wikipedia and the tabulated data seems to come from Wikidata.
Wikipedia's text content is licensed under CC-BY-SA, which means that if Google isn't giving attribution somewhere then they would be in violation of the license.
Google gives attribution when text content is used.
For simple bibliographical information like who someone’s spouses is, it is not copyrightable, and no attribution is needed.
This is really the biggest problem I have with the cards. They don't tell you anything at all about their source, and lead people to believe that Google itself has verified and checked the source of the information, making it very easy to treat them as "facts". A somewhat (possibly overly?) cynical viewpoint is that Google likes to keep it this way, since it makes it seem as if they're the arbiter of that information.