Radon myths, like assuming that because your neighbor has radon that your home does as well, are common. Each land plot has its own soil composition, meaning that simply because your neighbor’s home has radon does not mean that your home does as well. Have an air test done to determine if your home also has radon.
Even in suburbs where the houses are built close together, it does not mean that all the houses in the area have radon in them. The way homes are constructed can alter the concentration or presence of radon from home to home. Their home may have foundation cracks that are missing in your home. These cracks let the radioactive gas into their home, while your home is fine, thanks to the crack-free foundation.