You've described most of the older males in my family on the Ohio side of the river. They root for UC when it's a good story... but generally they are OSU football fans above everything, and if there is any perceived threat to OSU based on UC's success, or if UC is getting too much love, they suddenly downgraded UC to "little brother" status and shit on them as small-timey whenever possible... and I would consider them casuals, probably, because even though they tune in for OSU every weekend, they couldn't tell you a full unit of 11 starters by name probably.
Family functions get interesting when sports come up lol, especially when they're feeling feisty and come at me about ND.