There are many reasons why Miss Priss: Good thought provoking thread...thank you
While there are many problems out there between mothers and daughters, seriously don't think it's as prevalent as between MIL's/DIL's.
And there are hoards of MIL's/DIL's who do get along, so they are not looking for websites with the same problem.
As far as SIL's and MIL's it usually works unless the SIL is abusive, lazy, etc. However, usually opposite sexes get along famously.
As far as women, they can be brutal...which is one of the reasons why DIL's and MIL's don't get along....some women will hold a grudge forever, some women are controlling...some are down right sick....
I work within a huge corporation and I'd never work for another woman...in all the years I've worked, have only encountered two women who were good leaders.....and I mean no insult to anyone here....however, it's what I've seen and many others have seen. Most women were put in positions b/c they are women...they are coddled by they're hirer....they have children at home and some of them are down right angry they are working....or feel guilty...some blame everyone else for they're mistakes...some are so concerned about creating a position for themselves, they will step on anyone to get where they're going....I've seen women come into a position, and illogically do wasteful things, I've seen women ruin careers and lives....some micro manage...I've seen they're secretaries cry and quit and bounce back and forth in positions, due to the deplorable way women run they're groups. Some even encourage back stabbing....and believe me, there are men like this, however, not nearly as many.
What I'm trying to point out is that women can be difficult to get along with....and a mother doesn't get to choose her son's wife. Or visa versa...so, you clash two women together where one or both are stubborn....immature, jealous, demanding, has no regards for boundaries...and expects something she's always dreamed of in a marriage or in a DIL but it doesn't work out that way...well, you're going to have a problem.
Believe it or not, I work with many young girls who are career oriented, with college degrees...we've talked about this subject many times...however, these women are mature and confident....I've noticed, and again, please note, I'm not talking about anyone in here....it's what I've observed outside of this forum in real life.
First, I've never known anyone personally who had a MIL/DIL problem. And the young girls I work with all love they're MIL's, dearly....but again, they are very confident girls, who are brilliant, and aware of the feelings of others...they've not only got a good education under they're belts, but also travel and worldly experiences with all kinds of people. I think that makes a big difference. Not in all situations, but many...another reason is when people come from horrible childhoods...that also adds to the situation...
If a person is immature, has very little confidence in themselves....hasn't had an education except for high school, hasn't traveled and has a hard time with social skills that person, might, and I say might, be a problem in a MIL/DIL situation.
because there are also many women who come from that same kind of background who are very stable successful people.
So one can attribute many reasons to your question...many...and I do believe there are people out there with SIL problems, however, the SIL is so abusive, that they would fear writing in any forum.
But there are many more problems with women then there are with MIL/SIL's. Because opposites attract.
And I'm certain there are FIL's who don't like they're SIL's however, men don't let it get as bad as women do...you put two women in the same kitchen, your bound to have problems...LOL