-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512
True, but: If one relay disappears for a while then the family may break into two if it was the only joint.
For the family (see #6662): 3cce3a91f6a625~8DE5 bc1245cbe16d5ee9b2~2D25
the connecting relay was down since 2012-04-04 and still karsten created the family in this case, but I'm not sure if karsten used more descriptors as would usually be available to an ordinary tor client.
https://metrics.torproject.org/relay-search.html?search=%24A0EA6A3D1B4D30F50...
one more example:
A: B, C, E (A is the connecting central node) B: A C: A D: A, B, C, D E: A
family = A, B, C, E