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Having sold a pup to a family with just such an arrangement it can work very well. Mine is also a sociable Spitz breed so it works brilliantly and the bitch is now nearly 6 years old.
The whole family came to see me to explain their dog sharing arrangement. Parents having lost their GSD were not dogless anymore, and the couple and their kids had built in daycare for their dog.
I would imagine a breeder would want to meet everyone involved.