Hi all. My novel features a young teenaged protagonist who is, for varying reasons, sans parents. She lives with a man who is essentially her landlord. Their relationship is fraught and the subject of much scrutiny as the novel progresses. For many reasons, I want the protagonist's parents absent, scarcely even mentioned. However, I am acutely aware of the https://tvtropes.org/pmwiki/pmwiki.php/Main/MissingMom trope and its propensity to fridge female characters in an attempt to provide depth or a tragic background. I really want to avoid this. So my question is: what do? How can I effectively avoid this trope without actually including the protag's mom as a character?