sctmom,
Some amount of chaos normal -- hope turned into learning experience for all.
We use an older boy as PL for New Scout Patrols, too, for the first 6 months. But our SPL and SM hand-pick one of the sharper 13-14 yr olds with maturity, demonstrated skills and ability to teach.
Parent's involvement is mixed blessing. They can keep an eye on their son, but do it from a distance. Sure son is going to make some mistakes and the leaders (hopefully PL) will call him down on it. Boy leaders will make mistakes, too, but that needs to be handled by the SPL, SM and his trained/exp