The Game just lost BIG in his ongoing family feud -- an L.A. judge ordered the rapper to cough up over $50,000 ... for allegedly beating the crap out of his cousin at a funeral two years ago.
You'll recall ... The Game's cousin Robert Kirkwood sued the rapper in 2008 -- claiming Game assaulted him at his sister's funeral ... when Kirkwood confronted the rapper about not paying for some of the ceremony costs.
The official judgment was entered a few months ago in L.A. County Superior Court, ordering Game -- real name Jayceon Taylor -- to pay up $50,580 for Kirkwood's medical expenses and other damages.
According to Kirkwood's attorney, The Game hasn't paid anything yet. Calls to The Game haven't been returned.