Not related to grandchildren. Flows to septic tank have ben checked and are fine. Tank is relatively new....2000 settlement chamber and 500 pump chamber with new leach field at the time. Sized for 5 bedrooms. Tank pumped usually around every 5 years per septic folks recommendations. Toilet issues even occur when just wife and me are present. So culprit is the toilets in my opinion. Even vents working as designed. Tested when we had a liquid malfunction by pouring about 4 gallons of water into bowl immediately after and there was a complete flush and no problem digesting the added water. So no clog. UGH........
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