My sister is visiting me for a few days, and today she came to school with me. I was afraid that some kid would have a screaming meltdown and really embarrass me, but they actually went out of their way to be good and impress her! A few times some kid would start to act up, then the others would shut them down with “Be quiet, her sister is here!” I was pretty impressed.
The kids were endlessly amused by the fact that we are both Ms. Rubin, so I told them to call us “Ms Rubin 1″ and “Ms. Rubin 2,” which they loved. They also laughed themselves silly over the fact that they could refer to us collectively as “Ms. Rubins.” They wanted to know who was older, who was more fashionable, who would win in a fight… And the fact that she was even there was a Big Deal, as evidenced by the fact that after first period every class entered the room with “Is it true your sister is here?!?! We get to meet your sister?!” By the end of the day I even had kids that I taught last year stopping by just to see Ms. Rubin 2.
The other highlight of the day was when we were watching the Bill Nye on skin, and he said that it takes 200,000 frowns to make one wrinkle. One of the kids, who I’ve had a somewhat tumultuous relationship with but has been improving recently with lots of TLC, yelled out “No wonder Ms. Rubin doesn’t have any wrinkles, she’s always smiling!” I don’t think I’m always smiling, but I certainly was then 
What a great compliment! Sounds like your kids really respect and look up to you!