We have a similar situation in my immediate family with my sister, she used to be a City fan, but quote "got fed up with City losing all the time" and started to support the scum. She is a stubborn one my sister and has stuck to her guns throughout the years, even when subjected to merciless piss taking at times and to give her her dues she actually went to games, unlike most of the plastic fuckers. I think it was also the extended family that turned her head, their smug crowing about being better and how much better it was to support the scum but we will never know for sure as she claims it was her own decision these days. This is the same extended family that have since become Stockport fans, before the advent of FCUM and the wearing of Norwich scarves, but deep down are still dirty reds as they turned off the CL final in 99 because they couldnt bare to see them lose and missed all the drama, a source of great amusement to the rest of the family,
I actually asked my old man very recently about my sisters rag ways, his reaction was to just laugh and say she always was awkward your sister, best to just ignore it and know that you've done right by the rest of the family.
Despite all they won, despite all our shitness, I never ever regretted supporting City, it was never difficult for me watching my sister go to CL games and cup finals, even when week after week of coming home form the match to my dad's usual line after yet another defeat, "that football team of yours let me down again". And derby day was torture for my sister, if they won, I would shrug and say so what we are shit its what we expected, but if they didnt win or even lost, the piss take was merciless and went on for weeks, it really was a no win situation and just a relief for her if they won, nothing else. Only in recent times has this trend reversed, no more than this season after the home loss, my sister has taken the piss successfully and keeps bringing it up, she has defaulted to the position of we are shit and we beat you, that served me so well for decades, but I have a warm glow inside, knowing the tables have actually turned.