Pasties - you could make big ones for the adults (with spice) and baby size ones for your lil one. All you need is some puff pastry, mince, onion, peas, corn, carrot and any other veggies you want to add.
Brown the mince then add the veggies and pop them in the pastry and bake!

Pasta bake, you can buy the packet mixes and just follow the instructions.

You could make devilled sausages, sausage hot pot.. just to change things up for you aswell.

Not sure if that helps.

Does he eat chicken or Tuna?