same situation here with my wife and her family. all cheese all the time. while my son, daughter anad new son-in-law all bleed purple. I had to marry her because I felt I had a civic duty to start breeding it out of them. so far so good.
My wife’s family are all 49ers, and I like you felt it was an obligation to society to dwindle the number of fans the 49ers have.
She is now a purple people eater supporter whom her family considers a traitor. They do have fun flashing their titles in my face, but revenge if mine.
Some day, some day.
LOL - that’s funny. I grew up in North CA, so I was raised a 49er fan (43 years now). I met my wife in N. Dakota (stationed at Minot AFB). That’s the Viking connection - Minnesota is the closest pro team. I’m not sure how the rest of her family globbed onto the Packers.