S.H.
IF my own child is riding again, I don't care if the other child is there and it doesn't cost much, so I put in coins for them to ride.
The parent is usually nearby, so I glance at them and say "Can she???" and they usually say yes. They thank me. I say no big deal.
Or I tell the kid to ask their parent(s) first.
Kids always just hop on those things. Whether or not it is moving and whether or not some other kid is on it.
Its really no big deal to me.
Those things don't cost much.
I can't expect ONLY my child to be riding on it.
There are several horses on it.
it is made for more than 1 child at a time.
It is a public ride.
Not only for 1 child.