One of my closest friends and I were born just a few days apart. Our birthdays are nearing and we have organised a joint celebration with our friends and families. We have about 10 mutual friends who are coming.
We found a bar that would cater for 30 people all inclusive, it's expensive and people will have to travel to the destination. I assumed we'd each have 15 invites and we'd divide our mutual friends between us. So in theory we'd both put 5 mutual friends on our individual lists leaving us each 10 invites for whomever we wanted to invite.
Friend was surprised and assumed that I'd put all 10 mutual friends on my list leaving her to invite for example her neighbours aunt's best friend or whatever. I don't want to be petty but I'd rather tell her that I'm now busy on my birthday and maintain the friendship without telling her that I don't think she's being fair. I asked her to divide our mutual friends but as she has a bigger family than I do she thinks it's only 'normal' that she gets the lions share of invitations.
Would I be unreasonable to cancel the whole thing and say I'm busy?