I have three kids they all around the same age.  My oldest is four years old.  My son is almost two and my youngest daughter is only six month.  Yes we were busy.  I am only 27 and my wife is 28 and the biggest challenge we came up to it's how to manage kids jelousy to each other?  How to break our time to give them even attention?  It was not easy but I will try to explain what we did and why it works.

at this age as most parents know kids want to have as much attention as possible.  How to satisfy them?  We organized our time the way it worked perfectly for all the kids.  My oldest daughter likes to draw.  We set up her room perfectly in order for her to draw what ever she wants and also be in the room with both children without let in my son to not let my daughter to draw.  The room was big enough to put a small gate across the room this way we can play with kids and also look at what my daughter does and time to time give her our opinion what a great job she is doing.  My son likes to play with the most.  We bought for him a special game from lego where he can try to build his own car.  he was pretty succesfull.  Meanwhile they do that one parent oresence in the room more then enough.  Meanwhile my wife can take care of the little one.  Feed her give her a bath and put her to sleep.  That how you can go by for most of two hours.  Then you need to take your kids outside and let them play on their or together with you this they can get tired a little and after lunch you can give them a  little sleeping time.  Again for this one parent is more then enough.  it also leaves the youngest one with the mother.  After the knap it's a small snack time ussually we prepare everything while they are sleeping this way we can feed them easily after they get up.  After we also try to play together where the youngest will be sitting in kiddy chair and try to follow what we do.  we try to pick something educational and make sure that kids will participate in this more then us parents.  That how you can waist another hour.  after the game kids are to go outside again.  With three kids it's very convinient to have a double stroller which we purchased at ebay and are very happy with that.  The oldest likes to ride a bike meanwhile other two can go on stroller.  On the playground you need to show them what they can do by showing them first this way they can explore after.  Again the smallest is always with the mother or the father.  After playground we ussualy giving them a bath.  While the youngest is sleeping we are trying to wash them and feeed them.  after we spend some time maybe 30-45 min of reading some good books.  trust me kids love it.  After they getting their milk bottles and a pretty tired and it very easy to puthem to sleep.  and then we can relax.  If it any help to any parent I will be happy.  Again you can also schedule different kinds of trips to museums or theatres or even farm where they can do a lot of different things.