"It saddens me to think that I no longer have the opportunity to spend these kind of special occasions with you. Maybe not entirely, but with you being so far away everything no longer feels the same and I accept that. But to be honest? It's getting tougher day by day, trying to battle this without you; but I'm okay. Getting to hear your voice is better than not hearing from you at all.
I miss you, and Happy Father's Day."