In ancient times the Rat was a protector and bringer or material prosperity. People born within the Year of the Rat are leaders. They are charming, passionate and charismatic which from what I know about Mother Gargle doesn't describe her at all. Maybe the leader part but that's about it.
I have a feeling TBL has talked about the Chinese New Year before but I can't find the strip if it exists. Also, why would a boy as young as Wilberforce know what the Year of the Rat means? From what I read, Wilberforce is about five years old but he looks remarkably older.
Must be all that Bovine Growth Hormones in the hamburger.
(Love the title? I do.)