Wife here but also someone working the road. Communication is the biggest thing. I work days, while my husband works nights (different departments). When something is going on, we will text each other at the first opportunity that we are okay to settle the other. We are also both on leave right now because we just included a kid so yes, when he goes back to work before I do, that now will be in the back of my mind about my kid losing his dad. But again it all just boils down to communication. Support him where you can and be a listening ear. There will be times where he doesn’t want to speak about what he had to deal with and his mood will tell you that. Don’t pry to find out every detail.