There is quite a lot of critisms of the replies on here. However it is easy to see that a lot of the replies come from people who are not MILs.
Being a MIL is NOT the same as having a MIL.
MumsNetters would accept that explaining to someone what it feels like to have a child, is almost impossible. But when it comes to being a MIL anyone even though they know diddly squat about how it feels, can post an opinion.
No one knows, until it happens to them what it is like to have son who acquires a partner, and how it will alter/ or not alter their relationship.
I am an intelligent, well educated woman and I had no idea, until it happened to me, what it was going to be like.
You really are at the mercy of who tuns up. If your DIl comes from a reasonable sane background and hasn't got too many issues, things will be different, but fine. The same goes for the MIL.
However there is too much evidence of the difficulties between the two women DIL/ MIL to ignore. It is not an easy relationship to get right and both sides need to look at their own behaviour and make sure that they are not driven by jealousy, the need to score points, the need to have control, the need to be first in the OH life etc.
There are faults on both sides.
Obviously it would be nice if we could all be open and honest with one another. The DIL/MIL relationship is a unique relationship and it is well worth trying to get it right with as much understanding and kindness and forgiveness as humanely possible.
If the post in this case could only fast forward 30 years or so and see herself in the same position as her MIL is now in. She may well have only sons. How would she like to be treated by a prospective DIL? Then that is her answer.