Finding the circumstance

I often can’t determine the circumstance. While I understand that a circumstance is something that happened or people in our lives, sometimes I get lost modeling it out. For example my husband and son are worried about the virus. My thought is “I don’t know how I can help them” this leaves me feeling helpless. I spin in worry about them and adopt their worries and end up not helping them.
Would the C be: husband and son are worried about virus…?
I guess I’m wondering because is the circumstance how someone is behaving..? And if it is – isn’t that subjective? Meaning I might think they are worried but someone else might think they are not?