As a rule, standard homeowner’s insurance policies will insure your partners in your home since they are your guests and are staying for free.
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I’ve had exchangers comment that their pets seemed healthy and at ease after being left at their normal home under the charge of exchange guests, whereas the pets are emotional wrecks if they are left in unfamiliar surroundings with friends or relatives. Especially if your partners are bringing children, they probably won’t mind caring for your pets. (The children may whine if they don’t get to care for your pets.)
Don’t hesitate to suggest that care for something of your partner’s (the dog, cat, and chickens) be traded for duties at your home (watering the indoor plants, gardens, and lawns). That’s a good way to save money.