We don't mind parents watching class and I think the 'distraction factor' is going to vary widely from kid to kid. We do have our classes are grouped by age. For the 6-8 range we have the
Leon Paul Mini-Fence equipment. We use their 10 week class curriculum. We also have classes for 8-12's and then 13-18's. This seems to put everybody on a more even plain of development although we sometimes break the 8-12's into Y10 and Y12 - depending on what the program is for the week.
The Biggest Thing about Y fencing (especially 6-8's) is that it should be FUN and not really competitive - nothing should be a big deal - including parental involvement. If it works, stick with it, if it interferes, volunteer to help with something else in the club while lessons are going on (or take lessons yourself!) Good luck and welcome to fencing parenthood.