Weddingbee boards

So my fiance's lovely sister and her husband bailed on our wedding at the last possible minute. Instead of calling her brother (my FI) and expressing regrets personally, she made her husband do it.  We were able to find a replacement groomsman the next day, so the immediate panic about the situation is over.  I had to change my programs and the tux stuff, but everything else is now settled as far as the wedding details.

I, however, am still furious.

Citing that they are "too broke" to fly down and don't want to drive, they bailed via phone. I understand that they have many SELF-IMPOSED money problems.  While their income is higher than anyone else in his family (who are all coming to the wedding, btw), they have zero money-management skills.  Even though they are near maxed on credit, they recently spent about $1000 on a pure-bred dog.  I don't normally care how they use their money, but PLEASE don't tell me in May of 2010 that you are going to be in my wedding, spend all your money over the summer, and back out last minute.  Her husband is a teacher, so he also could have been WORKING all summer, at the very least part-time, to be able to afford a plane ticket.  

The bottom line is, I felt they handled the situation rudely and frankly, DON'T CARE to be at the wedding. They didn't even come to us personally to ask for a loan or tell us they really wanted to come.  And this is her only brother and the last wedding in the family.  He has bent over backwards his entire life to help her out, and he stood up in her wedding just a few years ago.  Could they not have called me in July and said that they really wanted to come, but weren't sure about money, and allowed me time to find another groomsman? The last-minute thing was inconsiderate.

By this point, my anger has settled into sadness, because I realize that I am going to have to deal with this person for the rest of my life.  Ugh.