Margie, they are easy to grow for seeds, I've read. You just should not let them sit around for long. I have 6 'McDill' and 6 'Vernon' I received in the mail yesterday. I'll eat them as they ripen and plant these seeds shortly afterwards. I've been begging for some seedling plants from a few sources over the past week as I'm hoping to get scions of about 8-10 varieties to bud and graft onto them so I can try out several. If things work out as I hope, I should be able to provide you with some scions so you can graft your seedlings.
I don't know how big your dad's tree is or much fruit your dad has, but shipping in the flat rate boxes is the best value to ship across country. I received 12 fruits in the "shoe box" size yesterday and shipping is a flat $8.95 anywhere in the U.S., regardless of weight. Maybe you can talk him into shipping you a box full every 2 weeks!
I've read that they can take heavy pruning, similar to figs, so you can shape them and keep them to a size that allows fairly easy harvesting.
Enjoy your fruits!