@Linkat,
I am really sorry. This is a horrible situation, I think.
There is a balancing act here.
You could assume that the risk of your husband coming back infected is pretty low (not zero... but low). Could you accept the risk to yourself and your kids? The risk is low, and even if you do get sick, it would likely be OK.
In this scenario, he could quarantine in house (as normal) to flatten the curve.. but be considered part of your family group. I would find this to be an acceptable risk (if my spouse were traveling for a funeral), I realize that people analyze risk differently.
The other option would be for him to find a local hotel for 2 weeks after he gets back. I would far prefer this to being locked in my bedroom. The "locked in my bedroom" option sounds like hell to me.