What would be special just for your particular guys? It might not be the same thing as would be special for my DH. Father's Day here isn't in June, but for my DH what would be really special is if the "kids" (both grown now, but you know what I mean -- the two who gave him the title "Father") were both to visit and go for a hike in the mountains with him. From me, maybe a travel voucher for somewhere with trains to ride and mountains to climb. Or a really great new, controversial, ground-breaking history book, maybe about some aspect of WWII, or China.