Just a quick update. The boys took my two younger siblings for a ride. They were led around on them. Even though I expect them to behave all the time, I was very happy with them today. Even though the littlies were running around and told to keep put of the horses way, the few times they did get a bit close the boys stayed as still as a rock and behaved excellently.
I then went for a short ride on them both walking and trotting and they were both very good. It was not a very long or hard ride but they were both sweating a bit afterwards. It was a pretty hot day.
Here is a photo someone else took of me on Sammy.