Family ignores me at gatherings - what can I do?

I have a older sister. At family gatherings my grandmother usually talks with me a tiny bit. My aunts and uncles always talks about and with my sister, about her school and such.
My mom usually gives me shit for leaving, since no one really talks to me and I just sit there. If I try to spike up a conversation, it's ignored most of the times.

Am I the only one? What did you do to change this?
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Family ignores me at gatherings - what can I do?
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