I don't know what I'll do if my dad doesn't come to my wedding!

[Achmayan]

Hi, I'm planning on getting married in the Mayan Riviera February 2013. To give you a little history, my parents divorced when I was three and my dad remarried about 8 years ago. My fiancé and I have been together for 11 years and have 2 kids. My dad's wife is a travel agent so obviously I asked her to help me with getting rates and figuring out all the travel details. I told her what dates I was thinking about and where I wanted to go. After they got back from Europe she got back to me with the rates and at the end of our conversation she told me that her and my dad can't 'commit to going to the wedding'. Now, I guess I'm in shock that my father would even consider not being there for me on my day. Especially considering they go on 6 trips a year. I really don't know what to do?! I always thought that my dad would walk me down the isle. Any suggestions???