Letters to the Editor
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Use the pool.
Easy enough. Find a use for the pool that would allow you to change the rules for the cousin.
You have kids. Why not have one of them in training for the swim team, or even have the swim team over to practice sometimes?
"Sorry, Janie, but little Chrissy is joining a swim team, and they're going to be using our pool for practicing.. You're going to need to call before you come over to use it, I'd hate to disappoint you by turning you away once you're already here."
Alternately, you can have a group that meets in your backyard and swimmers would disrupt it. Have some friends over in a book club. have the meeting schedule change weekly, so, again, the cousin should call first before coming over.
What you want to do here is change the circumstances enough that you are able to get the cousin to call first. The actual trigger can be anything, but you need an excuse to provide cover for revoking 'just stop by' privs.
Just my $0.002.
-napalmgod