Hey Arnold!
Grandpa's Sister (4x23)
Air date: Oct 16, 1999
Grandpa's sister unexpectedly shows up at the Boarding House, but Arnold doesn't know why she and Grandpa are always fighting with each other.
- Premiered: Oct 1996
- Episodes: 190
- Followers: 127
- Ended
- Nickelodeon
- Daily at 18