The fact is that "most women" do not hate their sisters-in-law nor do "most women" necessarily prefer their brothers-in-law. The question cannot be answered since if proceeds from unsupported assumptions.
They are sisters in law.
It is simply not true that a majority of the wives and their husbands' sisters don't get along and are mostly at loggerheads. Some women are like that whether they are sister-in-law or not. It has more to do with personalities and culture.
One way of looking at things:Typically it is an older brother that is jealous. It is usually because that is his little sis and he was always the one to protect her. So if the husband does anything to her it usually the brother who will support her. He is basically giving up his role of protecting her all the time. But do note that it is really not jealousy its more just a feeling love and protection. Another viewpoint:It is not true or correct to say that most brothers are jealous of their sister's husband. Some are, some are not, and no one has counted to see which group is the most. Making that assumption is uncalled for.
It can be young children by their parents or middle aged women by their husbands or partners. Mostly 18-24
husbands' ex: All of the women have their husbands' money.
their husbands, their husbands could do anthing to them basically and if they were not to obey they would be beaten.
No.
It is a kind of respect but only of the learned and worthy husbands.
Well probably because men are most likely to defend themselves more than women.
Depending on the girl, she may think that her partner sister is a bitch(sorry if it offends) and the brother may be more like her partner and she can relate more to him
Possibly many did when husbands were away for years at a time.
Little sisters have grown up playing, frolicing with their elder brother without restraint. There is lustless bonding that has grown over several years. This gives them ease to be close to their brother, but his wife is surprised because she did not have such intimate relation and sharing with her brother. This is not eulogised in cinema, which focuses mainly on romantic love. Hence, wife is astonished.