<human>: My sister "Rhonda" (41, female) had her fourth and last baby a few years ago.  I've been to every baptism of every niece or nephew, except this last one.  Rhonda informed me less than a week ahead of time, which coincided with the three-day weekend I was to go out of town to visit an familly friend. Both my middle school-age son and I were off of work/school on Friday, as was my friend and her children.  

My friend lives in a resort community a few hours away. I am a single, working mother (female, 42) with not a lot of free time or money to make trips like my sister can, so I did not cancel, thinking she could understand both her lateness in informing me and the nice opportunity it afforded me.  There was no party following the baptism.  I was not asked to be a godparent.  

This is not the first time Rhonda invites me to attend things at the very last minute.  I told her that I had made other plans out of town with the family friend and that it fell on a three-day weekend.  Both my parents came from fairly large families, and I never noted that it was a tradition that every single aunt or uncle made it to every baptism, so I did not think I was breaking a long-standing tradition.  I've always taken their last-minute invites as a lack of needing to plan, since most of the women in my family are stay-at-home moms and wives. 

I ran into my cousin Sarah in town when I reached my destination.  Sarah is particularly close to Rhonda, and immediately asks why I am not at my nephew's baptism.  She acted a little bit miffed, herself about it.  

Fast forward a few years later, and in an argument about something entirely different, my sister reminds me of how I didn't even attend her last child's baptism.  She remembers none of the context, and still carries a grudge.  

Did I do the wrong thing?  What is the ettiquette for attending family baptisms.  Is there something I missed?

Can you give me the gist of the text in a nutshell?
<bot>: Years ago, I missed my nephew's baptism and my sister is still holding a grudge.  Was I wrong in not changing my plans for a last-minute invite?