Hmm I think we should stay on (dead) objects, which are a kind of heirloom.
Pets or animals are another thing, especially if people are also interested into the breeding.
Businesses, Ships (e.g. as a workplace) could fit well in the organisation data structure I mentioned back when talking about “Sets” in Gramps:
Families record close individuals through biological (and non-biological) relationships (e.g. parent-child), associations do that for friends and acquaintances and organisations would connect unrelated individuals through their jobs/positions in an organisation.