J.C.
What a nice thing for you to do!
Here are a couple of recipe blogs that might help with ideas:
http://www.foodallergyqueen.com/
http://piginthekitchen.blogspot.com
We have family with various allergies. Basically, cook with whole foods and avoid processed/canned foods and avoid spice blends (that's the rule of thumb for almost any food allergy.) A yummy squash soup would be lovely this time of year. Or chicken and rice soup. Chili and lasagna are great for heating up (make sure the noodles are egg-free).