Don't forget the twice removed! All super long relationship chains need a twice removed somewhere in them.
Funny thing, given an earth-like ocean and atmosphere, a planet of aliens would probably look super strange and unusual... except for crabs. Crabs are such a common evolutionary step that there is an actual scientific term for "Noncrab animals evolving to be more like crabs". So do aliens exist? No clue, but if they do, and if their home planet has biomes similar to earth's, then they will probably recognize a crab.