I have 3. Number 3 was a suprise. At the time I was pretty pissed off about the extra kid, thought I couldn't afford it, didn't want to have another blah blah blah. Turns out (he's 11 now) he's the one that contributes positively to my sanity and I thank god every day for the "little suprise". Oldest is 20 going on 14, H.S. dropout and has this crazy idea I'm supposed to let him stay home and play video games (I'm giving him his eviction notice as soon as I get home from my trip). For a comparitively "easy teen" as far as his disposition, I failed miserably with him somewhere along the line. The middle kid is 15, a prime example of ADHD and beyond being one of the most intelligent kids I ever met, he's been a total nightmare to raise.
Doesn't matter how many kids you have, just love'em the best you can and guide them right.