How can you incorporate both boys in the wedding?

I am going to be getting married in a little over a year. Between my fiance and I we have four children. My daughter is going to be the flower girl and his daughter is going to be 16 and be a bridesmaid. There are two boys. One is going to be twelve and the other eleven. This will be my fiance's second marriage and the youngest boy was the ring bearer last time. How can I incorporate both boys in the wedding so that neither feels left out?