I know it's early to be this worked up over this, but I'm already fired up over my baby shower.
My mother and MIL are going to throw one for me and we've already talked in general about what I'd like (general location that would be easiest for people to get to, month, brunch vs lunch, etc). Nothing formal yet. For some reason DH is ALL ABOUT this shower and convinced me that the two mothers don't really know how to plan and that I should help them out by starting to call some places. I feel like that is rude to plan a shower and then ask others to pay for it, but he said well just to give them some ideas on prices.
I agreed and yesterday called some of my top spots. I called 5 places, 3 of which have emailed me menus. Yesterday we picked up my new car and the dealer is right next to my parent's house, so we picked them up and the 4 of us went to dinner. I mentioned to my mom how I started calling some places, and some of the ones I like are already booking spots in the months we had talked about. She wasn't offended AT ALL and laughed because she knows I like to plan things far in advance and actually thanked me for the help. I told her that I am fine with wherever they pick, but here is some ideas just to get started and I'll be as involved/uninvolved as they want.
So here is where the problem lies. My mom likes to invite EVERYONE she knows to stuff like this. Our wedding guest list was a HUGE fight. We held our wedding at a hotel downtown and it cost approx $100 per person for dinner. We had approx 300 people there. Each set of parents gave us a very generous gift towards paying for the wedding, but then DH and I footed the rest of the bill. It got so bad at one point that I had to tell my mom that her list was cut, and for any additional person she wanted she had to pay. She did. She gave me a list of extra people she wanted and a check. I felt bad, but it was getting out of control. My bridal shower likewise was huge; however, I had 10 bridesmaids that pitched in so it was manageable.
DH is already flipping out about how I need to have a serious convo with my mom about how many people she can invite and we can't have a big shower, etc. He says its ridiculous and she needs to significantly cut her guest list. I agree with him, but when I tried to approach this to my mom yesterday she got really upset. She is the type of person that wants everyone there and is afraid of hurting anyone's feelings. I worry about my parents because I want them to be able to afford to retire one day and I'm worried that will never happen. My mom has worked at the same job her entire life, so she feels like she needs to invite every single co-worker. Its crazy, but how do I tell her who to invite when she is the one footing the bill?
In a similar fashion, she wants me to invite all of my female neighbors. I barely know them but she tells me I'll regret it if I don't. I will def draw the line there, but that's the type of person she is--she wants to invite all the people. I just pulled up my bridal shower guest l had saved on my computer and my mom's portion of the list was 68 people. That doesn't include my friends, co-workers, etc.
I'm just frustrated because I feel like I am stuck between my DH and mother. I want to make both happy, but someone will be upset. Is DH being unreasonable or my mom? How would you handle? Looking for any input here... (sorry so long!)

Re: Baby Shower Rant (warning: long)
I would say if Momma is footing the bill, let her have at it. If there is a cost per person involved, I would hope that she would take that into consideration. Just let her know how you and DH feel about it, that you don't want her spending her whole retirement fund on a baby shower....but you don't want to tell her she has to limit the invites either......now if you and DH are paying, then she needs to respect your wishes 100%
We will just be doing a firehall or sportsmans club. Hoping to pay around $150 for the rental and food will be pot luck. Thats how my family does big parties though, so it won't be anything over the top or out of the ordinary. I will probably choose the theme, and be the main planner for games and such. I will probably get some help from my sis or cousins.
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I can understand why you're upset and I'm sorry you're in this position! A big wedding and such really doesn't surprise me and they are typical and most people feel that it's a "come one, come all" event. But, a baby shower should be YOUR closest friends, IMHO. I've never been to a baby shower that wasn't small with family and the closest friends, except of course the work time ones where it's only co-workers.
I say, if you want a small baby shower, that's what you should have. Besides at that time in your pregnancy, who wants to deal with a whole bunch of people?
Good luck. I cannot imagine a bridal shower where 68 people are just the friends of the MOH! I didn't even have 68 people total at my shower!
For you, the shower is being planned by and presumably paid for by your mom, so I don't think you can dictate the invite list, particularly if they're her friends. In terms of your neighbors, I would put my foot down on those since you don't know them. Your friends and coworkers don't necessarily NEED to be invited to a shower hosted by your mom. That is her choice if she wants to invite them. It is not unheard of for friends to plan a separate shower from the family shower.
Will this be a co-ed shower? Will your DH be there? In that case, you could say to your mom something like "DH and I want to make sure we know everyone at the shower and can have the opportunity to speak to everyone, so please limit the guest list to people we know." If DH isn't going to be there, I'm sorry, but I don't think his opinion matters as much.
In the end, the shower should be planned by the hosts, not the parents-to-be. Give your opinion/thoughts/concerns, but you may need to back off and give in.
My MIL is the same way. DH and I were married in my home state and didn't expect many people from his state to come, but MIL had me send out, seriously, two hundred invites to people she wanted to come. I kept freaking out that we'd have 400 people at the wedding! Only 50 came from out-of-state, and nothing was ruined by it. For my baby shower we invited every woman at our church and over 40 people came. It was busy, but my hosts asked people to help with food and it worked awesome! I felt really cared for and we got a TON of our baby needs taken care of.
If your Mom has offered to throw you a shower, than the guest list and location are up to her. Give her your guest list, offer up suggestions if she asks and show up - that's about it! ETA: This is coming from someone who had 2 bridal showers, one of which had 90 guests, so I get it!
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ETA: I recognize that it's a gift and the grandma to be should have some freedoms, but I really think there ought to be a limit. I know I'd be uncomfortable if my mother invited a bunch of women to my baby shower that I wasn't close to.
I suggest take a step back and let your mom an the shower she wants to throw for you.
And depending in the dynamic between your mom and MIL, it may be necessary to tell your MIL to either step down as co-host or throw a second shower.
Good luck navigating that!