<human>: Can you condense the text into a few key points?

It all started a few years ago. My brother knocked her up, and they got married. They didn't know she was pregnant until after the wedding arrangements, supposedly. They frequently came here to his home state, he is in the military and is based elsewhere, and it was all fine and peachy.

We see how much my brother loves her, and how he treats her. But, I honestly think it's getting to her head and it really upsets me. He went on deployment, and she came here by herself. She seemed fine. After that, getting them to come here was like pulling teeth. It was excuse after excuse. Whatever, they're starting their life together.

So, I went on vacation there. I seen how she treats my brother. After a 12 hour shift on watch, he had to unload the dishwasher when he got home because she was too busy all day. And by busy, I mean doing a load of laundry and facebooking. Not my place to say anything, so I just let it happen and continued on. 

They fought the next night about who was going to drive home. She hates driving at night, and my brothers seizures came back. So, she yelled at him. That was it. When she took me to the airport I let her have it, I didn't care if I hurt her feelings she was being a bitch. 
 
This past week, my brother has been really sick. She found out her grandma is dying. Today she left my brother to go to her dying grandma. 

Should I say something considering he isn't in good shape, and none of my family can take care of him? Or should I just let it pass?
<bot>: my sister in law is a spoiled brat, and left my sick brother high and dry to go visit her dying grandma.