In-group vs. out-group concept

You regard the in-group member as yourself so you DO NOT add "-san" to your group member's name when you introduce your in-group member (colleagues, boss, even company president) to out-group member (client).   When you talk directly to your colleagues, you add "-san" to their name as you always do.

You regard the in-group member as yourself so you use "haha" or "chichi" when you introduce your family members to non-family members.   When you talk directly to your parents, you say "Okasan" or "Otosan" to them.