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Visiting vacation rental with immediate family
No, you cannot deduct it. There's no business substance in such a trip, it is your vacation, and as such cannot be claimed as an expense against the rental income. You may be able to deduct the coffee you buy for the meeting with the property manager while there, but there's no way you can justify a 7-10 days vacation with your whole family as an expense to maintain the rental property. Since you will only have less than 2 weeks personal use, you won't need to prorate expenses, so you have that at least.