how old?

We were on the first day of our journey to D.C....
On the tour bus traveling through the mountains...
I was gazing out the window, listening to my iPod, when I noticed C and one of the moms looking at me expectantly...
I pressed pause just in time to hear my daughter explain,
"No, that's not my sister, that's my mom."
Oh.
The very next day, we're in DC...we've just visited the White House (really truly we got the background checks and the representative approval and apparently I'm not a criminal because my background check came through okay because I visited the White House!) and the FDR Memorial and Arlington and we're eating lunch across the street from the National Archives and I'm just dying to go over there and look at the Constitution and the Declaration real quick...
So I go over to the tour guide and ask her if we have time to go over there really quick and she says no...and she is kind of mean and really short with me!
And I said okay...I'm not a southern woman for nothing...I just turned on the charm and explained why I thought we'd have time...
And she said again, no, and then she said, "You'll need to ask your mom if you have time later."
Oh.
It must be my hair.  I have no idea what I'm doing wrong.
I called C 'Sis' the rest of the trip.  She didn't think it was funny, AT ALL.