I think I have a solution. Cats, when they are unsure of someone, will
not eat with them around. This includes family.
My cat, when he was a kitten, had to be left alone to eat. It took a few weeks til he was happy with us around. Now it's all we can do to keep him from our food
So, I would leave the little one alone with some meat and some dry biscuits (and lots of water) he might eat.
Beautiful cat, by the way