My 2, 4 & just now 6yr olds clean their room (They make their beds and know where their toys, shoes, clothes and the trash all go...he 2yr old's the only one that needs help), help with dinner and setting the table, put the dirty clothes up, help sort laundry from time to time and put clothes in the dryer. My oldest son gave our dog food and water every day when he was 3 & 4, but we've taken over that job for the past year (we moved and the set up isn't as easy for him), but he's going to start that chore back up again. We also have them help us pick up around the house when we do big clean ups. They put up their own toys, and they get jobs like washing the walls, cleaning cabinets, dusting, etc when company is coming or when it's just time to do major house cleanings. They also help with the baby. My 6 year old (started when he was 5) watches the baby for me while I take a shower and gets her what she needs/wants and keeps her from fussing. My 4 & 6yr olds also help some with diaper changes. They took a sibling class and learned how to change diapers, so they change diapers every now and then if it's just wet and we're in a big hurry and I have too many things to do. I usually have to refasten the velcro, but they do a great job otherwise. My children get rewarded weekly - small change - only for cleaning their rooms and big day cleanings, but they don't get any rewards or compensation other than hugs and kisses just for helping me out (like with the baby or cooking, we tell them that's just what has to be done for a happy, loving, well-functioning family). If they don't do their chores, they don't get rewarded, and we give the reward to the brother(s) that do the work for him (plus a little extra for doing extra work). They also help with unloading the dishes sometimes, but I think we're going to make that a daily chore for them very soon.
Oh, also, when we go shopping, the 6yr old unloads the groceries, etc, from the car, the 4yr old unpacks and puts away everything except the fridge stuff, and the 2yr old puts away the fridge stuff (with direction to where it goes...only the 2yr old now, though)...this has no reward, either, because it's just something that just has to get done, and they've never acted like it was a chore but just something that's automatically done when we get home). And, they pick up sticks, rocks, etc outside before Daddy mows the grass (without any kind of pay, but they get rewarded with special outside activities afterwards like pool time in the summer, moonbounce time, painting rocks or windows, just anything that is stuff that has to be done outside that they don't get to do very often).
This might seem too much to some and not enough to others, but it works well for our family. I don't expect any of it to be done quickly or perfectly, just what's appropriate for them (not a specific age level, but each of them personally). Most of the stuff, other than cleaning up their room and toys and backyard, are things that they love doing and do well, that's how they became their chores. That's why my 4yr old unpacks the groceries while all my 6yr old does is help unload them, because my 6yr old hates unpacking and my 4yr old loves it and loves putting things "in their place". My 2yr old likes to act big and always begs to put things up, so he gets the few things that go in the refrigerator, plus he can pick up and carry milk and my 4yr old is to much of a weakling to, so it's a good job for the 2yr old.
You just have to know your child and just test his limits of what you think he can handle and how much of it (daily, weekly, etc) and know that he's only 5, so you might be able to do it better AND faster, but HE needs to do it to learn responsibility and how to be a member of the family "community" where everyone has to chip in to make it work. Most stuff he won't be able to do just right off the bat, but he'll learn and pick it up quickly enough and be ready to add on to it. You're 3yr old is old enough to be doing things too. At that age everything is still fun. My 2yr old is the BEST cleaner upper just because he thinks it's fun. He never even leaves bible class at church until he's helped cleaned up. All of my boys were like that at that age, but then they grow out of it when they realize it's actually work, so take advantage of it while you can. :)
K.
SAHM of 3 boys and a baby girl(6, as of this past weekend, 4, 2, & 8mths)