[HPforGrownups] Harry Potter's grandparents? Are they alive or mentioned in the books?

[Scarah]

No: HPFGUIDX 161777

zuhm:
> Curious about Harry Potter's grandparents.  Wondering if they are
> ever mentioned in the books and are they alive?

Sarah:
They are mentioned in the books.  Lily's parents were proud to have a
witch in the family, which Petunia says in PS.  James' parents took
Sirius in when he left home, and Sirius talks about them in OotP.

They are not alive.  From the World Book Day chat in 2004:

"Rita: What happend to Harry's grandparents? Will we ever learn about them?
JK Rowling replies -> They're all dead and not particularly important
to the story, although you will find out a little bit more."

Sarah