Volunteered at the kid's school today. Had this conversation:
Kid: You're Booger's mom?!
Kid: Are you sure you're not his mom? (points to her Asian classmate)
Me: We're both Asian but we are not related in any way. I've never seen him before today. I'm not his mom anymore than she is your sister. (points to her Hispanic classmate)\
There you go. Not all Asians are related. Always happy to assist.