Party poopers...

So this last weekend we celebrated my son's 5th Birthday! I truly can't believe he is already 5, it seems like only yesterday that he was just a tiny tot running around making random funny noises. The party was a big hit! All the kids were well behaved, besides the oldest child who often times pushes my son's buttons, and gets on his bad side. They are good friends though, I had to step in once to point out that the party was my son's, and that for today, it was all about my son and his happiness. The kids played a few games, and random friends showed, most of which I was happy to see come.
However, a future sister-in-law decided to bring her bar pick up from the night before. This didn't go so well with me, I am just not one to come to a party where I am not invited. And I certainly wouldn't bring with me my fling from the night before. I guess if it would have been just a random adult party, that would be different, however, this was my child's birthday party. It was intended for family and friends, not for random strangers. As, you can tell, I am very annoyed by this. My fiance has promised to talk to his sister about it, as he thinks that it was inappropriate as well. It would have been different if I would have received a phone call asking if it was okay, at which time, I would have said no. I, my fiance, and our son, were not given that respect. To make matters worse, I am somewhat protective of my son, where we live there are a lot of pedophiles in our town, which makes it all the more annoying when someone brings a stranger to interact with a bunch of children. And why would some guy even want to come to a child's birthday party, be around his flings parents and family, it just seems strange to me.
Perhaps this person is a very nice guy, I don't know, I wasn't even introduced to him. Yet he ate and drank on my dime, and didn't even thank me for the free meal. I found him to be a bit rude, and ill mannered. Yeah, I am upset about it.
Perhaps, I am over reacting... I don't know, it's just not how I do things, and I don't know what to think about any of it.

However, minus the freeloading stranger, the birthday party was a success, everyone had a great time, and the children played, ate candy, and had a lot of fun.... This whole party thing, makes me wonder if I really want to have a wedding, I am strongly thinking of eloping... Parties are stressful! And a lot of work!