Thank you you all for your comments. Others are welcome to add more please!

Tonyhanna1-Our son is 8 years old and will be in 3rd grade.
Frenchieman-The non salary benefits of this offer are significant and will push me WELL past the threshold of 92kUSD.
Moving (even though only temporary) is a very difficult decision for us. With the added stress of an unfamiliar environment, the care of my home in the US, and the job requirements, the LAST thing I want to worry about is running short on cash. Part of my willingness to consider this move is the fact that we would have the opportunity to learn a new culture, and we would be only a short flight to Europe for travel. If the offer does not support having the funds to do this, I will need to seriously consider saying no to the offer.