How do I go about getting ownership of my deceased father's firearms? (Pennsylvania)

Hi all. As the title says. My father passed in 2020 and his guns have just been left in limbo for a long time. A quick google told me that they WOULD go to my mom, but they also said the recipient needs to have a firearms license, which I do not believe she does. I don't either, for that matter, but I intend to get one.