At least three possible solutions spring to mind:
a): Grandpa's died and the family are getting rid of his most treasured possessions.
b): Grandpa hasn't died yet but his kids have transferred them to his smartphone.
c): Grandson tells grandpa to 'get rid of all that shit and listen to it on YouTube. Oh and, btw, I hear that that record shop you used to hang out in looks like it's closing'.