I work in the bakery department. I work on average 20 hours a week and I'm happy with that amount of hours at this time due to other things going on.
They're currently in the process of hiring for a part time employee in my department. If someone gets hired, and they would get more hours than me, would that make them higher in seniority or not?
I didn't think it would but one of my co-workers said it would.
No, they would not have seniority over you as long as they remained part time. In fact, since you actually have more seniority over anyone they hire, you could claim some of their hours if you wanted them.