The one of the last times I did “funeral” food was actually before my friend’s mother died. I had some drumsticks in the freezer so thawed/cooked them with a simple herb marinade, made a big salad, a veggie dish (I forget what it was) and a starch (ditto). Brought it all over and the family dug into them. My friend said it was a great primal release, chomping away at the drums. I know I brought food again after that but I don’t remember what it was.
I would probably do something similar again–probably chicken breasts, again cooked simply, that can be eaten “as is” or made into chicken salad or another “left-over” preparation. Kabobs are also good (any protein) and simple to prepare. If you’re up to grilling, that’s a perfect way to go. Casseroles tend to look funky after a few days IMHO.
One last thought–some people’s comfort food can be another person’s “I won’t touch it with a 10 foot pole.” Best to know what their preferences are before you send/bring anything over. Great idea (above) to get input from the neighbor’s kids as to what they like. You never know how they’ll respond.
It’s great that you’re doing this, hope it works out well.