<human>: The family member in the title is not exactly family but she is my boyfriend's younger brother's girlfriend. To start, we are very family oriented so we do many things with our families such as weekend dinners and birthdays so I have gotten to know her pretty well. To make it easier, I will refer to mine and her boyfriend's family as the E family. 

The thing is, I've been to dinner just her and me before and we had a genuinely great time. She's very nice and an overall good person. However, what bothers me is that there seems to be this unspoken competition or rivalry between us when we are with the E family all together. She always needs to be the center of attention at dinner and show the E family's mom she is committed to the family by talking about how she knows them better or has inside jokes with them. She has skipped holidays with her family to spend it with the E family and she is skipping Mother's Day to go to E's family. 

Another thing that drives me insane is that my boyfriend's best friend came over and she immediately took over the conversation and thinks they're friends now. She acts like she knows all of my boyfriend's friends and she doesn't. She always needs to meet everybody and be friends with everyone she meets. 

To make it clear, she has a very nice family. They are very close and we have met them on occasions and she is always talking about her brothers and sisters and she is close and very kind to them. 

I guess it just bothers me how involved she is to the point of giving up her own family for it. I am not like that. I value them but if it's Christmas, I will go over for a few hours and go home to my family. I don't sleep over their house as often as she does and she gets jealous when E's family's mom talks to me or my boyfriend and I cook dinner for his parents.  

Is it a competition? How do I make it better?

Provide a brief overview of the text.
<bot>: my boyfriend's younger brother's girlfriend is obsessed with his family to the point of giving up her own and it bothers me how she acts in front of me like she needs to show she is more committed than I am.