King Charming Thursday XII
King Charming Thursday XII (Grandfather Thursday) is the father of King Friday XIII, Paul, and Claire. He is also has six grandchildren -- Nicky Quentin, Polly, Kevin, Prince Tuesday, and Lady Aberlin.[1]
Grandfather Thursday's Great-great-great-grandfather was King Monday IX.
Images

Notes
Although a picture of Grandfather Thursday is not seen, he is mentioned in Episode 1615.
King Charming's full name is confirmed in the 1954 book Our Small World.[2]
References
- Episode 1553. Mister Rogers' Neighborhood
- Carey, Josie; Rogers, Fred (1954). Our Small World. Reed and Witting Company. p 15