Am i wrong for being mad about this?

My fiance has 2 daughters. Due to circumstances before I came along his sister had temporary custody of them the youngest since she was 6 months old and the oldest at 4. The dad now has full custody but pays his sister to keep them during the week so the oldest can stay in same school. The other day she had graduation pictures made and posted them on facebook and never even tagged me in them but tagged the dad and her husband and her own daughter in them. Then I was told today that the oldest daughter is having kindergarten graduation but only 2 people can go so his sister and him are going and I can just live stream it. I'm very hurt by this because she doesn't tell me anything about the girls but can send her dad pictures during the week of the girls. At the oldests B-Day party few weeks ago she took pictures and none of the pictures with me in it where posted and she knows I have facebook. Me and my fiance have the girls during weekend and really it's more like I have them alone because the dad hangs out next door or has something else to do. And I feel I have the right to be included in stuff about the girls as well. Am i wrong for being pissed about this?

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