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Believe it or not dot, its all down to the brother-in-law not pulling his weight around the house, he is lazy, and his wife knew what she was letting herself in for 17 years ago when they got married, but i think its grinded her down over the years, and she just can't handle it anymore, he admits to being lazy, their are other issues like they don't communicate, they don't really have a social life due to her working all the hours under the sun.
They really need to air their views/put their cards on the table, myself and my wife told him a few home truths, he took it well mind you, lets just see how tonight goes.
Ps, they never ever argue with each other niether, thats almost unheard of these days, they both want to say things to one another, but fail to pluck up courage to say something through fear of hurting one anothers feelings, very strange if you ask me, tho where all different