"Being retired from Biking...isn't that kinda like being retired from recess?" Stephen Colbert asked of Lance Armstrong
If your dad is a serious cyclist, he ought to understand that saddles are a very personal choice. It can be hard finding the right one. It really doesn't matter how "good" the brand is in this area. You need one to support you in the right places and take the pressure off other spots. Also tell him that you need to work on your fit, with stem size and position in addition to maybe swapping out for shorter reach bars, because you are having some pain.