Do the problems only occur when the grandchildren are thee? Not that it's them specifically, but simply a larger number of people. Grandchildren usually come with parents, etc. We had the original 1960 style at camp. Brand unknown, and they always worked fine. We replaced them (2) with low water users, brand unknown, no problems. Just saving water. At home, we're still on the originals from 1977. Kohler(?).
I don't think the toilets themselves are the problem. Maybe the use is too intense at specific times of day for the size of your tank? This all assumes septic, not sewer. How big is the tank, how old, how often pumped? If you do a lot of water flow all at once (toilets, showers, washing machine, dishwasher, all in the morning, that may just be too much for the system. Please note, those disinfectant wipes that say "flushable" ARE NOT. Whether septic or sewer, they're just clogging the system, maybe at home or at the wastewater treatment facility.
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