I am kind of having this same issue...my parents said they will absolutely be there...but I have overheard them say they don't know how they will be able to afford it. I know they will be there no matter what, but I don't want them to go into debt to do it! (Although, they are already wayy into debt) I was thinking of paying for them, but then felt guilty that we should pay for FIs parents too...
Even before we decided on the DW, we told our parents we were footing the wedding bill, so they wouldn't have to worry about it...but my mom has always insisted on covering 3 things: the dress, the pics, and the music. Even those will send her into debt...
I am loving planning this, but I can't help but feel guilty whenever my mom is around the planning process...I know it is going to be hard for them...but for me, there's no turning back...I will just have to figure out if we are going to pay or not...ughhh