Those of you that are getting help from your parents, set boundaries NOW. Our situation was that we were told a set amount was our wedding gift and what was left over we would get to keep. Most of the problems FI and I ran into in the planning process was because we didn't set boundaries. I'll give you a few examples:
Ceremony: FI and I wanted a ceremony at his church closer to him mom who is in a wheelchair could just be pushed there in a few minutes. We ended up at the Catholic church I went to as a kid because my dad is a born again over the top Catholic.
Reception: We wanted something outdoor and we kind of got it. We are using their barn but they have made the process hell and added in things we really didn't want and took away almost an entire loft without asking us.
Music: We were okay with an iPod reception. They then said that they would hire a band that they love and we HATE. We settled for a DJ.
Food: We either wanted a potluck (not proper etiquette by any means, but it's the norm in his family) or a fully catered meal that came with tables and chairs and a staff. We ended up with my moms catering friend who has been very unreliable up to this point.
Photography: I stood my ground on this one, there was just a lot of fighting involved and I am still getting comments made around me by my parents about the price ($2400 for 2 photographers, a videographer, unlimited time the day of, engagement photos and 3 photos albums - a good deal)
Just take my advice and set those boundaries now before you get to much further into planning things. It will save you a good amount of headaches and you will be happier in the end.
In the end we will still have a wonderful day this Saturday but I don't think we would be in the current situation we are emotionally and our stress level would be much lower.