You are right, Jeff. Hannuka doesn't commemmorate a "minor" victory, rather a big and important victory in Jewish history.
It restored the Jewish sovereignity over Jerusalem and the re-inauguration of the temple.
Excuse me for saying so, Lee, but your s-i-l's religion seems like a totally fucked up mixture that belongs neither here nor there.
It seems like a homemade concoction with no real connection to Judaism whatsoever.