The one bitchy relative who is late for EVERY. DAMN. THING. Everyone, even my 89 year old mother, has to wait for her, no matter what.
If you are ALWAYS late, you are an immature narcissist-- period.
I had a similar issue when I was married.
If my ex-wife was the reason we were late for anything, I was supposed to be patient and just wait.
If I was the reason we were late for anything, I was worse than Satan.