Best wishes to you on the new baby , and prayers for your Dads challenges.
Lance Sasser or Morgans Guide Service would be excellent choices.
Ask THE GUIDE for suggestions as to what month they would prefer to book the trip. I promise you their answer will be based on when they feel the fish will be the most predictable and easy to get to.
If you were to ask me I would hands down reccomend November.
but you need to ask the guide...