Unlike adults, children often don't tire of eating the same thing every day. As long as it is healthy and he eats it, I wouldn't worry too much about repetition. When he stops eating it, then it's time to get creative or try new items.
There's really no need to make separate meals for your youngest. He can eat small pieces of what everyone else eats. Try steamed veggies and chicken cut into small pieces that he can finger feed or stab with a fork. He probably can't yet handle holding a turkey or peanut butter sandwich and taking small bites, but you can cut up the bread, lean meat and cheese into small bite size pieces for him until he is older and ready to eat it like his big sibs. Here is a sample diet for a toddler (age 1 to 3):
Breakfast
½ cup milk
½ cup cereal or oatmeal
½ cup sliced fruit such as banana or berries
Snack
½ cup yogurt
½ cup cut up fruit
½ cup water or milk
Lunch
½ to 1 slice wheat bread
¼ to ½ cup diced lean chicken or turkey
½ cup cut-up veggies or fruit
½ cup milk
Snack
Cut-up string cheese and a few whole grain crackers
½ cup water or milk
Dinner
¼ to ½ cup diced fish, lean poultry or beans
½ cup steamed broccoli or sweet potatoes
¼ to ½ cup whole grain rice or pasta
½ cup milk
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