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|"Lisa's unknown relative" is not an official name.|
|Lisa's unknown relative|
|Family||Lisa (unknown close family relationship)|
John (unknown close family relationship)
Unknown Male Adult Rabbit (Number 2) (unknown family relationship)
Unknown Female Adult Bear (Number 3) (unknown family relationship)
|Cartoon debut||"Arthur Babysits"|
Lisa's unknown relative is the unknown relative of Lisa and John. He cannot be the father of them because Unknown Male Adult Rabbit (Number 2) is, however he may be the old design but it is unlikely to be true. He may be an uncle or a cousin to them.
- Arthur Babysits (cameo)
- Muffy's New Best Friend (cameo)
- The Boy with His Head in the Clouds (cameo)
- Arthur Loses His Marbles (cameo)
- Pet Projects
- Arthur and the Haunted Tree House
He was seen playing Bingo in the introduction and turned around to stare at Thora Read when she was being loud about her victory.