The heat always gets turned up when special events and monumental life moments are involved. It is hard not to compare yourself to someone so close to you and become a little competitive. One woman was shocked when she found out her sister was jealous and angry about the surprise vacation her boyfriend planned her.
My sister has always been a "wedding" person, as in she's dreamed and planned her wedding even before meeting her boyfriend. Now that she's engaged, she wants it all: expensive cinematic venue, guest list in the hundreds, designer dress, etc, and she cares a lot about being the "the first" and making everything "special and just hers".
I legitimately have nothing against that and I'm happy that she's getting what she wants. The issue arose because my boyfriend planned an anniversary getaway to a tropical island that happens to be where my sister planned to honeymoon.