@CostaI think I can help with the Vet Clinic, when you go to the vet as a owner, you are the vet, everyone in the household is the vet there is no one sim, that is the vet. On my other save I been using that for my teen sim to be a vet when he is not in school for a while you can treat your dog by just taking the dog to the bed and it will start, though best to do that when the vet is closed though so you don't have customers complaining. If you go to the vet as a child of the vet owner the vets will not show up and the place will auto close, because the owner on lot is invalid.
For the Retail lots, non owned lots auto open. The store will have the last state saved so if the store is closed when you visit, you can't buy anything at the lot. Owners don't have to go to the lot to open it, just use the business pannel in the UI and find your retail lot and click the open button. Also everyone in the household is the business owner, so you can't visit the retail lot as a sim in the same household as a customer. Lots are saved in the same state the owner left it, unless changed remotely by the UI interface.
Edit: I forgot, if you are having trouble getting retail employees make sure you got them hired as owner, and that there are sims in the retail career, since it is a playable career now for young adults and adults. You at least need one sim in retail career to spawn the retail co workers for your retail shops.
