I have been in your shoes and you can survive this. Your father in law is comforted by knowing you are both with him and he is not alone. Talk to him now and say all the things you want to say as it will help him and you let go. I can talk from experience as I have walked this walk also. He is being called home from his journey as his work here is done and I am sure he is proud of you and your husband for having the courage to be with him in his final days. Sending you both love and light.