I use "we" quite often... why? Because 9 times out of 10, I am going too. I am sitting there, and just as unable to make any other commitments as she is. (And sometimes, it's the whole family of 7 people. If that isn't a "we", I don't know what is)
I will never take credit for my daughter's accomplishments or live through her. I will take credit (with my husband) for raising her. And I have my own life filled with accomplishments (no matter how big or small) in my previous work, with music and with swing dancing.
"We" doesn't mean I am fusing myself to my daughter. It can simply be inclusive language--and a whole lot faster than saying "Short Stack has a Meet, and I am going too"
ETA, this post was not intended to be antagonistic in any way. Just offering another perspective... the use of one word does not necessarily indicate a braggy parent. And I will cede that I have come across a braggy parent or two who do use "we" that way.