FI is an electrician working as an engineer in a local high rise, he has a good working relationship/friendship with his boss. He would like to invite his boss to our wedding but worries about whether or not that would mean he would have to invite everyone. The ladies who work in the office absolutely love him. They were so excited for us when we got engaged and wanted to hear all about it. He wouldn't call any of the engineers friends and doesn't feel particularly close to any of them. His boss recently got married and told FI he wanted to invite some people but that it was either invite everyone or invite no one in his opinion. We just can't afford to invite everyone as we both have large families and the guest list is already close to 150 people. So can we get away with just inviting his boss to the wedding or does it have to be an all or nothing type of invite?