Brother knows more than the doctors... again

Mom called Thursday all in a panic because Dad had as fever.
Me: What's his temperature, Mom?
Mom: It's 38.4C.
Me: Oh, I said, I think it's just above normal.
Mom: what's normal?
Me: Let me google it. It's usually 37C but can range from 36.1 - 37.8 °C
Mom: Does he have a fever?
Me: If you didn't know what the normal temerature was, why do you think he has a fever?
Mom: The site around his g-tube is oozing a bit and it smells funny.
Me: He might have a slight infection, he's been fighting a cold for the last week, so that might be it
Mom: I called TeleHealth and they told me to get him to Emergency, but the last time we went when his g-tube came out, we stayed there for 10 hours.
Me: Anything other than a lost limb and you're going to stay 10 hours at least
Mom: What should I do?
Me: I'd wait a few hours and then take his temperature again. I'm sure it's nothing.
Mom: Ok.

So Mom ends up calling Brother because she wanted him to take his temperature in case her thermometer was broken. He tells her how she is abusing him because she won't let him use a stationary bicycle. And that he should use the treadmill downstairs. Brother verbally abuses her infront of Dad. Dad doesn't say anything. Mom sends me a CC of an email to Brother. She says in her email how disrespectfull he's been especially over the last year since Dad has been in the hospital. It really started long before Dad got sick, but this has just made it worse. She noted in the email that he has never stopped by the house to see how she's doing. She reminded him how she looked after the kids (for free while he stayed home not working). She told him to return the key to the house and that if he won't she'll have the locks changed. She told him God is watching and what goes around, comes around.

I'm sure he'll just laugh it off as Mom. Dad needs to step up to the plate and voice his disapproval on this matter. If I never see my Brother again, so be it. Nothing lost.