The grandfather I live with thinks my legs would be a wow in them.

Then what difference should it make if your grandfather thinks you're wrong.

And his grandfather thinks he can still teach him something.

"My grandfather just thought he could build a good car."

Your grandfather thought highly of you and he seems to have been a man who was usually right.

My grandfather thinks his son's death was bad luck, but I do not.

His grandfather hadn't thought of looking behind the doors and taking those when he went.

His grandfather had not thought it worth while to take those with him.

Your great grandfather no doubt thought it impossible to record music.

My grandfather thinks it's ridiculous for people to talk about the rights of animals.