Who to invite?

My fh and I aren't big on inviting children to our wedding, and since we are on a tight budget, figure that it should be an adults only affair. However, my mom and my fmil disagree. My fmil hasn't been as vocal, but her first list of possible invitees included quite a few teenage family members. My mom, on the other hand, has been very vocal and has even hung-up on me when talking about. She has also had a case of selective amneisa -- forgetting things we have discussed and even imagining me saying things! I don't want to fight with my mother, afterall she is my mother and my parents are contributing the largest amount of money to our wedding. But I wanted that money to be able to cover more than just the food. At the rate we are going, the my fh and I are going to have to cover all costs excluding the food and location. This puts us way over our initial budget. My mom was so upset about the no children thing that she has added an extra $1000.00 to our budget to cover the cost of any teenagers. This is a very generous gesture, but she doesn't seem to understand that even with that extra money my fh and I can't afford the wedding decorations, flowers, and favors that people expect from us. At this point I have hired the cheapest photographer (one that offered a "digital only" package with no albums) and dj we could find. And, what about flowers? I looked at flowers online at Costco, but even their flowers are out of our budget. I love daisies, but they aren't popular right now, so I can't get real prices right now. Costco doesn't have daisies on their website. I am hoping that I can go to the flower district in downtown LA over spring break to look at flowers, but I don't think dasies are popular until the summer. I just want simple white shasta dasies with a few yellow gerbera daisies-- nothing fancy. Then there is wedding cake. I'm not a big fan of cake, and I really dislike the big and gawdy wedding cakes that everyone displays. So, I decided not to have wedding cake. This did NOT go over very well. So, now my moh has volunteered to make me a small and simple cake that we can cut just to make my mom and fmil happy. I'm letting her do it because I don't want to argue with anyone about it. If anyone asks me about the cake I can just say "it's taken care of". Our receptiong dinner includes a viennese sweet table, so I don't see why we have to feed everyone cake on top of that. Ugh. Ok, sorry for the rant. On the upside, I am even more exicted than ever about the honeymoon.