Hermione's parents are muggles (so she's muggleborn). Both are dentists. That is why they are so interested in seeing Gringgot's Bank and she puts a memory charm on them and sends them to Australia while she is on the run with Harry and Ron.
You joined up just to back me up about Harry Potter! woohoo! welcome to the forum.
If I wasn't such a NERD I wouldn't have posted at all but I just had to stand up for Hermione