Google is testing a new knowledge answer, above the knowledge cards, that show you who is related to who when you search for a famous person's name in search.
Ari Finkelstein shared a couple screen shots of this on Twitter, here is one of them of Google's co-founder:
As you can see, it shows who Sergey Brin is related to, not just in blood or marriage but also in terms of ones professional life.
I personally cannot replicate this but it is nice to see.
This reminds me of the people related to feature Google was testing based on Google+ profiles.
To clarify - do 2 consecutive searches for people that are connected ( I searched "Larry Page" followed by another search for "Sergey Brin") and then Google shows you people that are "related" to both.
— Ari Finkelstein (@arifinkels) December 5, 2017
Forum discussion at Twitter.