It is illegal to drink and drive anything...even a horse. Where were the marina police? I would have called 911 if I were in that situation. Especially at night...in the dark.
I hope ya'll were wearing life jackets.
Is this your husbands younger sister? It sounds like he's trying to protect them and keep them safe. I don't think he's being oblivious to your feelings on purpose but I think he feels like he's stuck in the middle and probably doesn't know what to do. He should be alittle more bold when it comes to protecting his own family though.
I think until his sister irons out her addiction you will always have these issues and drunken interludes. I'm sorry that your boy has to witness his Aunt being a crazy drunken loon. That's a shame.
I think you and he should seek counseling over his family. Remember, alcoholism is a progressive disease so don't expect it to get better.
Wishing you peace. Alcoholism is a painful disease in more ways than one.