I have 7 in school this year. I forgot how much trouble the 2 and almost 4 yr old could get into without siblings around to keep an eye on them. I have to wait for the big kids to get home to get anything done.
On the upside, it is nice to not have kids fighting over the pc all day. L, almost 4, gets a turn everyday now. And if S (2) takes an afternoon nap, I can spend some time with L, helping her with games or making crafty stuff.