My sister has a freeloader BF 😒

Hey everyone, so my sisters bf does not want to work and she’s currently working 2 jobs back to back and has a lot of bills to pay and take care of their toddler. One day she asked her bf to go pick up their son from day care because the baby wasn’t feeling well and because she’s working full time and wasn’t able to get the baby her bf said no, and got mad that he moved back to his mothers house leaving her and her toddler alone, a week later she had to travel out of town with her toddler and have asked me to take her to the airport and I did, she left me her apartment Keys so I can watch her apartment and her car keys, she drove to my house and I took them to the airport in her car so I had to keep her car until she’s back or should I say when I pick her up in her car….. that’s not the problem the problem is that he wants the key to the apartment to get his stuff “the things he took when he left were his clothes ps5 and the tv” 😒 which I said to my sister I think the fu&@ NOT not with her not being in her apartment NO, then she said he needs the car because he has an interview the next day and I said NO, what is he thinking???, and my sister what is she thinking?, he left them , he took his “necessities”, I find it odd that he wants her keys like wtf? I told her I wasn’t gonna give him no keys until she’s back and she decides what to do, they being 4 years together and not once have I seen her happy, now that she’s single I find her doing well on her own, he’s a freeloader, I hope he didn’t take him back but now am stress because she will not be back at least for another week, what should I do what if he comes and Threatens me about the keys, her apartment is no her name only but my idiot sister added him as a co owner on her car 😒 I don’t know if he has the right to those car Keys I have no idea she still owes that car btw, my poor sister has to do EVRYTHING by her self while this dumbass won’t work and won’t even help her cook or clean, her life is a mess with him. 🙃