Both of my brother in laws are this man. They have their faults, but they deserve sainthood for dealing with my sister and sister in law. I have no idea how they do it. Both of them are very similiar, and have a "it will be what it will be attitude" and are super aloof. Both are intelligent and capable, but both also don't do shit around the house when it needs to be done. They just use all of their energy not exploding on the crazy they deal with day to day. So apparently it's a trade off.
I love both my sister and sister in law and enjoy their company, but they both don't pull that shit with me because they know I'll call them on it. Respectfully, but still call them on it. It's pretty funny watching my interaction with the two of them and my brother in laws' interactions.
In 22 years I've seen my sister's husband snap on her 3 total times. And it was brutal. Luckily my sister was wise enough to take it, and move on. I've known my other brother in law for 12 years (married his wife's sister 2 years ago, they are nothing alike lol) and seen him snap once. But it was crazy. It was "do you ever shut the fuck up?" She quipped back and he lost it. SHUT. THE. FUCK. UP. and walked away. 10 minutes later it was back to business as usual lol