The Grammar Patrol has Arrived in My Life...

Since my brother has all but stopped reading and pointing out all the grammatical deficiencies in my late night postings, I've been resting on laurels and thinking myself rather fine....until yesterday when Big K piped up from the back seat....to make a correction. We were talking about a fire truck making its way home. I said something like "he's" on the way home (referring to the truck, I think) and K says, "No, mom. You have to say "they" because there is more than one person on the truck. " I hung my head in shame all the rest of the way home. I could hardly face my grammar class that night.