Looking after my own

I've not been one to start a fight, and am the kind of person that if anything is said about me, I keep it to myself and can laugh it off, most of the time.
But if anyone does anything to someone that I love, then that person would not know what had hit them.
One night I had had a great night out with friends, but as soon as I opened the front door I could tell that something was up.
I walked in to find that Gary, my brother in law, was in one of his well know paranoid mad moods and had smashed the front room up, as well as hit my sister, this had me already angry but when he went off again as soon as I had looked at him he threw a mug at me which missed me but hit my mum.
I just lost it and saw red, literally, and as he was about to start laying into my sister again, I ran up to him, got my arm around his neck and dragged him back.
I could hear my dad in the background shouting at me not to get involved, but I was in a rage myself and had only one thing on my mind.
I'd put Gary on the floor, and when he saw me he was shocked to see me ready to smash his face in.
I yelled at him to pick on someone who was more his size instead of women.
He just kept saying , "ok, ok" and ran out of the house.
I was about 16 at the time.
Thankfully, nothing else happened for years, until I got married.
The first instance was only after a couple of months of marriage, when my so called brother in law (wife's sister's husband) tried it on with my wife.
I came home from work one day to find my wife deeply upset and crying in the bedroom. After she told me what happened, that the fat bastard tried it on - while he had his two kids there as well - I went straight up there and banged on their door. his wife answered the door, I told her I wanted to see him, she asked me in but I refused, looking back, it would have been better if I went in confronted him in front of her as well, although I'm sure that she wouldn't believe me.
He came to the door as if nothing had happened, but as soon as I started threatening him he started to panic and it looked like he was going to start crying. He begged me not to say anything to his wife, and to this day she knows nothing about it...but her parents do.
We used to go to the local community centre every week for a drink, there was a bloke there that took a fancy to my wife, that was soon stopped when I stood up to him. At one stage we were face to face but he backed down.