My daughter was 4 when she had to patch..3 days on, 2 off, and so on...for several month to strengthen her left eye..she also wore glasses at the same time. She always did well with it.
But she had to patch all of her favorite "babies". This seemed to help her cope. Also, her Gramma made glasses for the more fave 2 or 3 of her babies ( 2 stuffed animal Dinosaurs and a cat Beanie Baby, by the way!). She did everything with her pals..tea parties, bedtime stories, she talked to them, etc. I think it helped her cope when people would comment on her patch or glasses (she thought it was fun to say "I am a pirate in training! LOL....shocked people who were a bit stupid to ask a 4 year old about it!!!!).
Even tho he is younger..beef him up...feed his ego...figure out what works for him..tell him how handsome he looks...find a figure he recognizes or knows and loves (a real person or a tv character, etc who you can somehow relate to it.) Get him a kids Spy-scope (one eye required to use)....just silly it up if you have to. Thats what we did and it just was no big deal for the long many months we patched..and wearing the glasses was just no big deal (for her it meant she could see).
Good luck!