Do this: i have 3 kids myself, and all of our vacations over the years (excpet Disney) have been on Hilton properties. Book 1 room for 2 adults and 2 children and let it go at that. Booking on more than 2+2 guests will raise red flags due to fire regulations, etc.

When our youngest was < 2, we put her in the bed with us, which was of no business to the hotel. We continued this for years, and as they've gotten older (10, 9, and 7), we now book 2-room suites and put one in the sleeper sofa. In time, we may have to go to ajoining rooms, but for now this works.