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Am I The Asshole? (AITA)

Cutting family ties

This is gonna be long but im gonna try to make it short lol. My sister is 5 years older than me we’ve always been “close” but now that im older i realized i was always there for her and her kids but it was never returned. Since i had my son 12 weeks early she was never really around. One night he had 12+ drops in his heart rate and we were 2 hours away because we wanted to come home for one night. I was 7 days post Csection so i couldnt drive so i asked if she would take me to the hospital because my fiance had to work it he was a contracted nurse so we wanted to save his call ins for absolute emergencies so when i asked her she said she would ask her fiance an hr goes by i dont hesr from her so i double text she says she is too stoned to drive so i said thats fine ill drive but i need someone to be with me it was midnight and she said no. So my fiance ended up calling in. Fwd to last year my car battery died and i was trying to sell it she wanted it so i agreed. It came time for her to make a payment and she said she is unable to then offered to give the car back i said no. Then a few weeks later she lost her job so i asked if she would be able to pay me for the car she said yes but offered to give the car back so at that point i figured it would be best to get it back. I told her to let me know how much the battery was on the car (we tried replacing it before she took the car but she said no) she again said not to worry about it. I told her im sorry and that i love her. Few weeks later she is ranting in fb posting things hinting that she was suicidal. So i tex her, nothing, i keep texting/calling and nothing. Then i finally get ahold of her fiance and he tells me she is fine. I told her its not fair for her to do stuff like that and not atleast let hs know she is okay. She starts to rant about it wasnt fair that i took the car back (though she offered to give it back 2x) and that i didnt pay her back for the battery ( i did i even asked her fiance how much it was he never responded) we dont talk for a week then my mom tells me she is crying saying she misses me and my son so we patch things up. Since i brought my son home from the hospital she flakes on me non stop. Half the time she doesnt even tell me she isnt coming anymore just ignores me. For my moms birthday i invited them both over for lunch she come for like 20 mins then had to leave because her dog got out she said she would come back. Then not even 3 mins after she left she tells my mom she isnt coming back when she texted me an hr later saying she isnt coming and that it will be nice for me and my mom to get time together i said “it would have been nice for it to be all 3 of us but thats okay. So fwd AGAIN 😂 to today i asked my mom if she would watch my son while i went to my birthday dinner she said she can but should would have to take him to my sisters for my nephews birthday party..i was not invited because “we were not on good terms and i guilt tripped her into staying at my house the last time she came over” i blocked her. Am i wrong for that? Has anyone cut ties with a sibling?