Help!

[Punkingal]

My mother-in-law is home under hospice care. My sister-in-law, her daughter, my husband and I are caring for her. My father-in-law won't let her rest, he is constantly patting her, crying in her face, talking to her when she just needs to rest when she can. She gets very agitated when he is doing this. He is 90, she is 89, they have been married for 67 years and it feels unkind to say this, but he won't let her go in peace, and it is driving us all nuts but when we try to get him to leave her alone, he yells and creates a scene right by her bed.

Is there anyone who has experienced something like this? What is the right thing to do?