(Strip Number 4711, Original Publication Date, 12 November 1986)
Panel 1: A few minutes later, Elly hands Phil a cup of coffee. As she does so, he explains that the music lesson is over because Mike just wears him out.
Panel 2: When she asks if he's making progess, Phil says it's relative.
Panel 3: She asks "relative to WHAT?"
Panel 4: When he says that if Mike wasn't his nephew, Phil would be down at the pub playing darts. Elly stops and considers.
Summary: What she should stop and consider is if Phil is child-compatible at all. The Rate-A-Teacher thing on Alan tells us that he's a temperamental blowhard who doesn't seem to grok children much so this confusing letting their daily lives get in the way of his teaching as their trying to deceive him bleeds into his avatar.