Am I jealous of my boyfriend's brothers girlfriend?

Anonymous
I've been with my boyfriend for two years, although our families have been friends for years prior to us being together. Anyway, we get along great and his family likes me. Well, last year, his brother got a new girlfriend. I will admit, I am jealous that she is always at my boyfriends house staying the night with her boyfriend, which I think is kinda weird, but oh well. Because she is always around my boyfriends family, I feel as though I'm an outsider around his family now because of her constantly being there. I realize I could spend more time around his family and I do but no matter how much I try to be around, she is always there more and has more stories about things they've done. Plus, she has only been dating my boyfriends brother for almost a year but from the first time she met them she has called his parents mom and dad. My question is, am I jealous of her or is there something justifiable about how I'm feeling? And is it weird for her to call them mom and dad when they have never told us to refer to them as that? Thank you for your time and advice, I appreciate it.
Am I jealous of my boyfriend's brothers girlfriend?
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