Grandpa Just Passed, My Car Is Legally In His Name... And His Estranged Wife's. What Do I Do

location: Pennsylvania USA

sorry if this isn't the right sub for this, i just couldn't think of anywhere else.

my grandpa passed away Thursday night. i wish i didn't have to think about this right now, but i drive a lot for work and if i need to get a new car then i should probably get on that ASAP.

a few years ago my grandpa had a ton of medical issues that i won't dive into here but it was bad. he also separated from his wife/my grandma (i'll just refer to her as his wife for clarity) around this time, although they never legally divorced. she left and refused all contact.

with everything that happened to him he couldn't drive anymore. i had just gotten my license and needed a car, and i was the one driving him to appointments as one of his main caretakers anyway, so his car pretty much became my car.

i was added as an insured driver, but since the title and everything is in his name AND his wife's name, he couldn't actually transfer the car to me without her. and again,, she would not talk to him. the car not being in my name never caused any real issues though so my dumb ass just never really worried about it. eventually i guess everyone else stopped worrying about it too.

life went on, my car was my car that just so happened to be in my grandparents names, but my grandpa said it was fine so it was fine.

now he's gone and i don't know what to do. in general really but right now i mean with the car.

is it entirely in his wife's name now? am i still able to drive this car?? like i don't know where she is, how to contact her or if she would even respond. i don't even know if she's still alive. i searched for an obituary and didn't find anything so that's probably good but i don't know. i've never had to deal with any of this before and i really have no idea where to start.

sorry if this is too much or not enough detail. doing my best here. i can clarify anything if needed. any help would be appreciated

(also sorry if the formatting is bad, i'm on the mobile browser and i'm not very good at this)