If you dont have the Fisher Price Loving Family doll house, I say it is a must! We have had ours for about 3 years and my kids all still play with it. We bought it for my daughter when she was three, so it is perfect for your age group. Also, something fun for outside would be great. Another fun thing is craft supplies. Everything from play doh to beads they can string, and of course, markers, crayons, colored pencils etc. If they dont have them yet, some kid friendly scissors would be well loved, esp. by your oldest. Finally, we always love to find dress up stuff. I have 3 girls, and one on the way, so this has worked for all of mine. Now if I could only figure out this boy thing, my son is a whole other story!! ~A.~