Did you ever think you might be hurting your wife more then your mother-in-law when you argue with her?
Not really,my wife is super cool & her mother is just a b!tc#,99% of the time she goes on & on about my spending habits,i paid for my wife's schooling,not her,she wines about my kids having money set aside for school,something she never did for her children & that my wife & i have allready done for ours,thanks to an inheratince i received years ago.
I own my home free & clear while she is on her 2nd mortgage,i own all our cars & motorcycles free & clear while she has 2 car payments,but my spending is outta control according to her
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Her big problem with me is what its always been,she does not like that her daughter married a biker,but she will never admit it so she dreams up crap to pick me apart over.
The person my wife is upset over is her mother but she puts up with it because thats what good daughters do.