We are only inviting adults to our reception. We do have some single young adult friends that we are inviting as well (because that's what we are currently until we get married). My parents are good friends with a couple that have 3 children so we are inviting the parents. The older 2 children are both in their 20s and friends of mine so they'll be invited as well. Also, the older of the 2 is getting married a week after we are and we are invited so of course she is invited. The youngest is a son, probably about 11 years old. He probably has no interest in attending my wedding and will have to spend all day at a wedding the following week. I don't really know him or vice versa. If we invite him, he will be one of the only kids there. Is it OK not to invite him although we are inviting the entire family?