Dear LFTP: the meteor shower and the granddaughters

• My brother-in-law changed my meteor-shower camping invitation by adding three granddaughters without asking — was I wrong to object?

The reader takes a letter from an amateur astronomer: he invited his brother-in-law camping for a meteor shower, and the brother-in-law changed the plan by adding three granddaughters without asking. The hosts agree the brother-in-law should have cleared it first, but counsel generosity — the stars aren't his to gatekeep. The Secular answer agrees: don't invite people along without clearing it first.