Thanks everyone for the advice! Turns out Mr. KR took a car home and didn't get here until close to midnight because his plane was delayed. So it's a good thing I didn't take the girls to pick him up!
I got to watch Big Brother 4 in peace, but I felt guilty the entire time (and rightly so! lol)! I should have just kept my mouth shut because looking back I didn't really need any other reason than that I didn't want to wake up the girls. Oh well, live and learn!
I don't expect this will happen again because he normally just drives to the airport himself. But his car was in the shop and he had to go out of town on short notice.
All is well; thanks again everyone!