I strongly disagree with the second sentence. Insurance companies do not like to pay claims. They will pull this kind of garbage on the thinnest theory possible and let the other party try to force them to change their position. Perhaps the sky looks green instead of blue to an adjuster who has received checks from them. If the 3rd sentence applied I think they'd be claiming 20-30% instead of 1%.This isn't OP's car or his policy. And insurance companies don't apply contributory negligence unless there is a pretty solid case against them. If son had the last change to avoid the accident (because the other car was more then halfway through the intersection when hit), then I would agree he contributed.