I'm glad you and your family are ok, and happy that someone else's insurance gets to take care of the costs for you.

FWIW, whomever estimated the speed at the time of the accident at 90-100mph has no idea what they're talking about. The guy in the G5 may have been driving at that speed at some point beforehand, but the speed at the time of the collision wasn't more than 40-50 mph. Having worked in a bodyshop for a number of years, I've seen many vehicles that have been in collisions at highway speeds (65-75 mph) with moveable objects (i.e. - other vehicles as opposed to, say, a solid concrete bridge abutment), and the damage sustained at those speeds seldom leaves a vehicle recognizable, much less as intact as that G5 is. A 90-100mph collision with another vehicle dissipates so much energy that it would leave both vehicles as piles of twisted wreckage, with very little chance of anyone surviving in either vehicle. There are plenty of YouTube videos of high speed crashes that will give you an idea of the type of destruction that they cause.