I think you asked this before... and just like before, I'll say it depends on the person
. Whatever we have in common basically, whether it be work, hobbies, interestes or just joking around saying nonsense.
If you're asking for advice on what to say to your co-workers then perhaps you are asking the wrong people. We have SA, remember
, we're not experts in conversation.
It's pretty simple, I think. Just be yourself. I assume you have no trouble being yourself in front of relatives right? Well, be like that...