I found this to be true - at least for my brothers versus my cousins. My Brothers are all married in good marriages where the women are comfortable and happy being SAHM´s. My Cousin 1´s Wife stayed home for a year and then threw herself into it again. She felt like her input was neither valued nor needed. Cousin 2´s Wife has been trying to complain about her Husbands "ungratefulness" for many a month now. Especially as they have 3 kids one of them only 9 months old. I think boys that know how much work cooking, cleaning and organizing a family can be are able to express that they appreciate it way more then those that are more pampered and catered to. Furthermore, gratitude is something trained - not inherently known. My Cousins were pampered and catered to, they never had to cook, clean up after themselves etc. and they also saw their father putting down his wife for being "lazy". My Brothers had to help in the kitchen and were also expected to take care of their room and the general upkeep of the home. My Father praised me and my mother for tasty meals and carefully decorated tables while also stressing how much time we spent doing it. I will try to remember that for my children.