Family Rosary

We were all saying the rosary together the other night.  I was helping Isaac stay on the correct bead.  We got to the third decade and he got off.  I tried to show him which bead we were on, but his rosary had lost some beads on that decade and I couldn't tell him where to start.  Not wanting to interrupt the whole family, I just shrugged my shoulders.  He turns to his dad and says, "Can we start over?"