what's the deal?

My sister gets a hamster and my mother calls it her grandhamster. I had a hamster when I was in junior high and NO ONE REMEMBERS IT! A few weeks ago when sister mentioned that she was going to get a hamster, I reminded my family that I used to have one. Sister said that she did not remember I had one and I reminded her that she was in high school at the time and very caught up in herself. My mother slowly remembered my hamster after reminding her of different things (like the purple hamster ball that I had - just like sister's). I was offended by my family not remembering my hamster, so that is why I am not being too welcoming to sister's new little dude. They all can bite me, including Fluffernutter.