If I had scheduled my (hypothetical) wedding EIGHT WEEKS before my sisters it would have been a real FUCK YOU to her as it it would have meant our RELATIVES would have to choose between weddings. Especially as with my family as pretty much EVERYBODY would have to fly in.
Look, I loathe Bridezillas. But… deliberately scheduling your wedding eight weeks before another family member’s wedding is the Bridezilla move here. In my opinion.