Is NOBODY wrong in the post ? POST : Wife and I just got into a fight because I heard her and our daughter on the phone with SIL and SIL says "I've got a surrrrprrriiiiise for you for your birthday!!!!!"

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I gave my wife a curious look and she said she'd tell me later.

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Daughter goes to bed, wife proceeds to tell me that her sister has rented a pony for OUR kids birthday party, at OUR house.

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This bothers me on 2 levels. The first being: Why wasn't I included in this decision/discussion...? I feel like this is something that should have at least been mentioned to me before it was decided upon? Am I the asshole for getting upset that my opinion wasn't even considered?

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The second thing though: I feel like this is a GROSS overstepping of SIL. This isn't some cheap little thing, renting an animal for a party can cost a bit as far as I know, and to me, this is something usually the PARENTS of the child would do... This really isn't the first over step by SIL either though, and I really don't ever get to say anything because wife makes me feel like the asshole. Last year I lost it because SIL wanted to get my daughter her first bike (mind you, that was her 2nd birthday). That's something WE do, as the parents. I feel like I'm constantly in competition with SIL and it pisses me off... Am I being irrational? Am I the asshole??