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Hello, JACustomer. I have been a Veterinary Nurse for over 15 years and would be happy to help you today. I'm reviewing your question right now.
How long has it been since he consumed food?
I think you are correct that he's dealing with stress from your daughter leaving, but it's going to be imperative that you determine if he is eating or not. Cats are prone to developing liver concerns, and even failure, after only a few days of avoiding food. Are you able to separate him to see if he eats?
I would recommend putting him in a room on his own or separating the other cat entirely. Fill the bowl, take a picture of it and recheck in a few hours. If there is a reasonable amount of kibble missing, he is eating. If not, you know that you need to be concerned. From that point forward, you can try enticing him with kibble, pureed baby food in flavors like chicken or turkey, etc. If he avoids eating entirely, he needs to be examined.