Not eating losing weight.

Age: 13 months
Weight: 8 1/2 pounds
He was 9 pounds, but lost half a pound in May. He is a VERY picky eater. I have him on Wellness Grain Free wet/dry. Breakfast at 8 am, dinner at 8 pm. Meals were 1/3 of a 5.5 oz can, but he had trouble finishing in a timely manner (1/2 hour). Always leaving and having to be brought back before it spoiled. Dry food as an afternoon nibble (less than 1/2 cup, usually a 1/4). I *think* I've narrowed it down to the wet flavors he likes (Turkey, Chicken, Chicken & Herring). Still, mealtime is a complete struggle. He is painfully shy and will not eat if there is a stranger in the house (my son's friend has been here for hours today, and he bolted upstairs and hid under the bed in my daughter's room for 9 hours). My daughter is coming home from college for a week long visit in 1 1/2 weeks. I'm worried he won't remember her and freak out over a "stranger". But then my mother-in-law is visiting at the exact same time. Toki has never met her. I'm worried he will be so out of sorts that he will not eat well, and lose even more weight. Should I just ditch the wet since it's such a struggle and stick with dry? He has a water fountain.

Thank you for your reply. I took Toki to the vet yesterday and he got a full exam including blood work. The vet said he is stressed. Probably due to people he doesn't know being in the house, lately. I just got some Feliway and some calming treats. I also went to an Asian grocery store and got some dried fish flakes to sprinkle on his wet food. This helped him eat his dinner last night and breakfast this morning. The vet also wants me to leave more dry food out for him to nibble on.
So, I think he is going to be okay. Thank you so very much for your time.