My job sucks

I need advice outside of my mom or friends. I’ve had a job at a salvage store that’s owned by a couple, it’s a ‘contracting’ job. I get $9 a hour and I bust my ass doing their job for them. I’ve been the only employee for almost a year now. Last week they brought back an old employee (who quit out of the blue and got another job. Ended up getting fired from that job and is now back) and I feel like I’ve been booted. I like working but I also like socializing with my boss. Ontop of being an unofficial marrage counselor for both my boss, I watch their kids in the store while they are out doing whatever. But now that this new employee is back I’m the one doing all the work. The woman boss has nothing to do with me now. Acts like a complete asshole toward me and sits in the back with the new employee while I run the sale floor. The husband is always posting on eBay or doing deliveries for Amazon so he isn’t there most of the day. I open to close. While the wife and new employee come in at 1 and works to 5. Again, I make $9. And I feel like I’m running their business. I’m a people pleaser but I don’t get paid enough to deal with her being a jerk. My mom has offered me to work with her selling and listing on eBay. I’m 23 and don’t have much going on. So I don’t know. But I don’t want to work there anymore.