Supplemental O2 and children

Does anyone have any experience using supplemental O2 with children ages
six and eight? Can this be done successfully (assuming the children are
very good at following directions)?

I am planning two round trip flights this summer in the non-pressurized
turbo Bonanza, one across the US from NY to Colorado and the second from NY
to North Carolina.

In both cases I would prefer to cruise in the mid-teens, which would
provide the best chance to be above the haze in the event that isolated
thunderstorms are about. Of course, all this would depend on whether my
children would be able to use either cannulas (preferably) or masks to
breath the supplemental O2.

--
Peter