I only share a house of a friend (he gave me rights to decorate) so I know that is 100% possible as is the change of House Name and Greeting (and usage of vendors and items). I don't know if he gave me "full rights" though.
The shared partner will not be able to ever sell your house and also if it is about the housing reclamation only the entering of the actual owner, not of those sharing, will reset the timer (45 days with mails announced in several steps). For a FC any member can reset this timer.
Hope that helps.


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Thanks to everyone who responded!


