According to your description of your motherâs behavior it seems to me that your mother might have a mental disorder. It is not acceptable to welcome her daughter and her fiancé with such great honor and then at the end to say âI wonât come to your weddingâ without a valid reason. She may need attention but the problem is how much and what kind of attention she needs. Her life with your father may not be good enough but children (including you) canât be guilty for that. You can help your mother as much as you can but you should have in mind that you have your own life to carry on and you should not allow your motherâs emotional problems to interrupt your private life.
You may need to discuss all these issues about your mother with your father before asking for any medical attention.