Poolside etiquette

[PollyProsecco]

On holiday, family near us being overly possessive with their inflatables. Our children have been told not to touch them by us, but being kids, they are obviously tempted to play with them. Especially when they are floating on the pool with no one else playing with them. Adults of family keep giving each other cross looks and now the inflatables have been placed far away from anyone’s reach. I just think this behaviour is odd - if it were the other way round, I’d happily let other children play with our stuff.
Interestingly, their children are quite happy to share their things and play with our children.
The situation now just creates an awkward atmosphere poolside. Who is being U?

The question here isn’t whether you would share or whether this other family should have shared. The question is when someone doesn’t want to share whether you’d allow your children to keep taking their things for an entire morning without doing anything to stop them?
I’m assuming that the people saying the op isn’t unreasonable would also allow their kids to take stuff if people won’t share with them.