This is very common. Three of these children are mine, 4 of them are not. We eat dinner about 5:30 or 6:00 each night. Thankfully I've been making large portions (to have leftovers the next day for lunch) and so when the kids come over we can share.
We love having them over. The kids always enjoy their nightly play sessions in the back yard with friends. It's interesting to me that basically all the kids that live around us are girls. My boys don't seem to mind though.