User blog comment:Bluegear93/Spacer background, Shepard's father ?/@comment-69.40.62.229-20130201180724/@comment-69.40.62.229-20130201181812

It also says, in the intro to ME1, that both his parents "were" in Navy meaning that 1.) Both are still alive. 2.) One is still serving (Hannah) and the other got out. Or 3.) Hannah is still serving and her father died at some point. Considering that we only ever hear mention of Hannah and Hannah never speaks of her father, I think it is safe to assume that Shep's dad is not in the picture whether from death or a family fall out. For my own purposes, I am going to say he died while in action.