Did the wife attend ND? Maybe she wants her boys to attend college and play football together? Who knows, could be a host of reasons. Blake is a RS Freshmen this year for Michigan, assuming Alex came in 2014 and redshirted like almost all OL's do, they'd have 3 years together in college. In 2015 Blake would be a RS Junior and Alex a RS Freshmen. They'd be in college together for 3 years- 2014, 2015, and 2016 and they'd be playing together in the same position group, being coached by the same guy, and spending a lot of time together. I could see how some really tight knight families and brothers who were close would want that, and I could also see how a kid would want to go and do his own thing separate from his brother. Point is, who really knows? We'll find out soon.
The talk about Tennessee with Bars does seem to have faded, and Witflong and other sources are saying it's a ND-Michigan coin flip.