Sibling

A friend of mine has a brother that is getting ready to turn 30.  Six months ago, she purchased tickets to see the Red Hot Chili Peppers at the Sprint Center in Kansas City on October 27.  She was planning on them going to the show together. He IS married and it seems he and his wife now have plans on that date, even though his spouse knew about these tickets WELL in advance.  Now she doesn't want