I just need to find this "Kim." The only household I know w/the name "Kim" is the Spencer-Kim-Lewis one.
If you own the Cottage Living pack, that notification might refer to Kim Goldbloom, who initially runs the grocery stall in Finchwick.
Unless your sims have access to Kim's urn or gravestone, though, they cannot "Strengthen Kim's connection to the physical world" as Auranaris explained.