I'm Karen's mother

My new girlfriend, Karen, got a job at a local hardware
store. "The owner doesn't want us hanging out with our
friends," she said. "If you stop by, tell them you're my
brother."

On my first visit I walked to the customer service desk
and asked the older woman there, "Is Karen around?" When
she looked at me quizzically, I added, "I'm her brother."

She smiled. "What a nice surprise. I'm Karen's mother."