Mom collects neither rent nor gratitude
"Rick" gave you a clue when he outlined that his relationship with his father dictated a different kind of behavior from him. Notice where Rick lives? With you! And notice whom he respects? Not you! You will not receive gratitude by demanding it. But you can receive rent. You are not happy with this arrangement, so you should change the terms. Either charge this couple rent or tell them it's time to find other housing.
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