Hey, I am so sorry!

What a hard time to be living through! I hope you both come out strong!
That said, maybe trying to lose weight at this time would just be adding even more stress, which you most likely don't need.
I'd say, try to maintain your weight--watch what you eat--don't let yourself go crazy on foods, but at the same time, don't add to your burden by trying to lose. You need all your strength for coping with your life situation, I'd say.
One thing that might help reduce your stress is physical activity. Can you take walks? Join a YMCA class? Check out some exercise videos from the library, like Walk Away The Pounds? This is a great strategy for feeling better and controlling weight.
Hang in there...
Jay