This is something that I struggled with FOREVER! In fact maybe I will go write an article about it sometime!
This is how I am doing my scrapbooks. I also have 3 children- one girl and two boys.
I have an album for each of the kids as well as a yearly family album. I agree with Lawanda 12x12 3 ring binders are the way to go for the kids albums because they are so easy to just add pages.
I do not make 3 of each page that I make. I have heard some people do that but I know that I would go completely CRAZY! LOL So I mainly scrap each childs events....for instance, their birthday all goes in their album then I do one layout for the family album. I do one page with a picture of each family member on their birthday for each childs album as well...usually the picture includes their cake so they can remember what everyones theme was for that year.
I also do a Chrismas album and a Halloween album because those are both events that I take a great deal of pictures. Enough pictures to warrant their own album! I typically end up doing a vacation album each year as well because I always have enough pictures from each vacation for its own album.
I do a page for each child of Christmas and Halloween. I will usually add a page of vacation in each childs album as well but they are mainly a family picture and then pictures of that child.
The way I look at it is I don't want each of my children ending up with like 30 albums before they are even 18! LOL If I make a page for each of them of every signle thing that I scrap and take pictures of they will have at least 30 or more! I think A few albums will be much more appreciated and cherished. The family albums will be a plenty and they can divy up the pages from those when I am gone if they so wish!
Check out this article for some tips on birthday albums!
http://www.bellaonline.com/articles/art28242.asp I hope this helps! Would love to see what others think about this topic and how you are doing your albums. I will add your ideas to the article when I write it!