I recently had the opportunity to do video on a wedding that we were not the photographer on. It was very painful to watch the other photography team work. The bride emailed me after the wedding that her biggest regret was her choice for photographer. Some things are best not to use family or friends for. Don't trust your wedding to someone other than a professional. A professional is NOT a family for friend that has done several weddings. Unless you have actually seen everything they have taken on those weddings, and love everything and nothing is missing, only then should you trust them with the most important day of your life! Anybody can take a few good pictures, but this is your wedding day, you want ALL good pictures. Plus knowing what to take, and how to pose it, is just as important, if not more important. You don't want your wedding photos coming back and you only have 2 or 3 pictures of you and your husband, or one family shot, etc.
On your wedding day, your mind will be going a million different directions. You really need a professional. A professional can keep everything organized, nothing will be forgotten, and you will have amazing photographs!