I open all my characters, together with my kids, and let them play with it for some time. My eldest 2 sons are 9 and 7, so they know how not to break stuff.
Then I normally put them in my display cabinets later on or they day after.
In cases where i replace a older model (5POE) for a newer model, i'll give those to my son(s).
However they aren't really that interested in that. What they really like to do, is playing a story together.
I'll just imagine some basic outline for a story (e.g. we need to recruit allies to invade a imperial base/rescue something/extract some secret data) then i'll improv whatever ideas they come up with.
So once a while i risk my collection to play together with my kids..
But i enjoy it, plus i'm there to supervise so they dont brake my stuff.