I have chosen not to have human children, and I do consider my cat my child. I left my husband because after I had adopted Harry (cat) (with his knowledge and blessing, I might add!) my father-in-law decided that animals were not allowed to live in the condo we were renting from him, and my husband refused to move to a place where pets were welcome. So I found my own place to live with Harry. I would no more have returned him to the shelter than I would have abandoned a child for the convenience of living in a property that happened not to allow children. (I don't know how common this is, but yes, my friend's landlord is one who does not rent to tenants with children or pets - so I'm not making that up lol.) I take my responsibilities as far as caring for him very very seriously; it just so happens that there are different behaviors required to care for a human versus a cat lol. I truly believe that when I brought him into my home, I took on the awesome responsibility of making his life as rich as it can be. When I make my work and social schedules, I consider his needs, not just food and water and cleaning out the litter box, but his emotional needs (eg., stress level, loneliness, etc.) as well. I hope that no one feels offended by this. Everything is just MOO and my personal experience.
<3
thank you for being such a great cat parent.
btw - it's illegal for your ex FIL to discriminate on tenants based on child status. It should be for pet status too, IMO!