Tonight with your 9 to 12 year old
The prompt
“What's your favorite thing to do indoors on a totally boring day?”
What to listen for
If they describe something they do alone happily, they've found a real source of self-soothing and independence that doesn't need anyone else's input, that's healthy.
If everything they mention involves other people, that's not a problem, but it's useful to know they may need more encouragement building comfort with their own company too.
If they say they're just bored and don't know, that's a normal answer for this age, no need to read anything deep into it.
What this tells you
This tells you how comfortable they are entertaining themselves and finding their own contentment without outside help.