My (thankfully!) ex-DIL was a very strange character. We tried for several years to welcome her in to the family and although this seemed to work in the early stages of her relationship with my son, it seemed that as soon as the engagement ring was on her finger she changed and then tried, and to a certain extent, succeeded, in isolating our son from the rest of his family. It got significantly worse once our first grandson was born and meant that, although they only lived 25 minutes from us, we could go months without seeing them. When we did, it was literally like walking on eggshells - a very unhappy atmosphere. Other family members witnessed it and were also baffled. To the best of our knowledge, we had never done anything to warrant this behaviour and, if I'm honest, it was a huge relief when the marriage ended - my son has changed back to the person he always was and now we see our grandsons regularly. I would never want to re-live those years again if I'm honest!