Why would you want to subject yourself to the constant strain of setting and maintaining boundaries with people who can't (in the case of the kids) or won't (in the case of their mother) respect them? Sure, you could build privacy fences, lock yourself away, and turn your property into a fortress in order to preserve your privacy, but why should you have to? You and your child are entitled to enjoy your entire property in any way you choose, not be constantly defending and restating your rules. You dodged a huge bullet, and I feel sorry for the homeowners, especially if 'next door mom' makes a habit of coming over to greet potential buyers.