Thanks, Cowgirl!
I know that if she and I are going to ever live in the same household, her son will likely be a part of the equation because of his health issues. So I want to be careful not to come across the wrong way. I really did feel good about talking with him last night. I was behind him while he was on his computer, I laid my hand on his shoulder while I talked to him about how they're getting along. He wasn't beligerant about it, or angry, he just stated that all they seem to do lately is argue. Instead of telling him that he has a bit of an attitude I said "you both have had a lot of stress lately".
Of course, he doesn't realize that his tone often sets her off, even when she's asked him a simple question. But I know she loves him with all her heart. It really hurts her feelings when he snaps at her the way he does, especially when it's unprovoked. Even though I'm neutral I can see that he brings much of it on himself. That whole television incident was completely out of line, but of course he sees it as "I was just asking" and doesn't think he had a tone. She's not perfect, none of us are, but I see how much she does for him.
thanks again for all the comments/advice/support...I'll keep you posted.