<human>: Give me the gist of the text in a nutshell

Sup Redditors,

So I've been married for six years to my lovely wife, we have two young children, houses, cars, mortgages. the joy!

Since the birth of our first things have been going downhill, I don't seem to be able to perform any task up to her approval, she constantly nit picks, complains, moans and bitches. 

The complaints range from major criticism of me, my body, my career, my family to tiny things such as "The garage light was left on" and "you've taken a toilet roll from one bathroom and put it in another"

This is only a short summary of all the things I seem to do wrong on a daily basis, I must be a real dick huh.

She has ostracised her mother and father, and the majority of her family too, this started over a silly little argument and although she's upset about it she won't do anything to try to repair the relationships.

Her relationship with my family is also a one of woe, to say her and my mother do not get on is well an understatement. 

In the past we had relationship counselling where the first 3 sessions were spent with her ranting about me, and all the things that are wrong with me.. I just listened on the forth session I snapped and spoke about my feelings. she cried and refused to go back.

I suppose I've come to the conclusion that we should separate, we've spoken about it before but as soon as I indicated I was serious it's as if she backs off and starts "behaving like a normal person"

I stick it out because of the children, I'm worried for their mental health and / or self esteem if we separate or divorce.

Lots and lots I could type but you've probably dozed off by now. :)
<bot>: Constant criticism in my relationship, she's ostracised her family and doesn't like mine. Admits freely that "She's always right".