Dull roar/ grinding noise

Those older Ford trucks had a reputation of frequent wheel bearing failures and that's what it sounds like. Caution your relative that they should get it fixed or at least evaluated. It's not an expensive repair but the bearing will only get worse.

Thanks tennisshoes and hornet very helpfull

I have 2006 Eddie Bauer Explorer. I did the rear left wheel bearing after it collapsed and luckily led to no additional damage.. Completed rotors/pads etc. as well. The rear bearing collapsed and left me stranded. Don't let the rubbing sound progress longer than it has to. I did the rear, I hear the front driver side going now. Rotate and balance after. Hope this helps... PS. As informed above, be aware these particular trucks have frequented all the same problems so this should help... Complete Hub Assembly by the way is the hub needed for your grind and rubbing sound. Good luck! Jon