Gets upset on small things and weeps.

Because there is not much known about the history of your mother , her personality, her life events and stressors that she underwent. I am just putting in a generic view here. And since you mentioned the incident with your wife. Many times females in our culture are not valued and have not gotten enough opportunities to be assertive in life. Now that she is a certain age and have you kids as grown up and married. Whenever your wife is around it could be a possibility that the mother feels insecure an unsure of her value in your life. Now that she cant be a parent of a child is a parent and a parent in law too. The imsecurities within are dealt in a different manner. Where what according to us might be trivial issues but they are things which she perceives as taking away her value away/or she perceives it that she d be wronged in a situation due to which she feels the meed to justify herself and go to any lengths to do that. At a personal Level avoid confrontations with her at any level. Also ensure or do things which otherwise reinstates your belief and value in her. Try to make her a part of a self development program/ social group/ anything else that she can look forward to as new in her life. If despite all of this nothing works. Have her see a psychologist. Few sessions with a counsellor could be a great help.

Hi Greetings from Lucknow! Firstly may I know from how long your mother has been behaving like this? Recently? Since the time you got married? Or since forever? Secondly, does she only behave like this when your wife is around or otherwise too? Either she is undergoing stress or is having other psychological issue. A detailed assessment and history is required sir Consult with me or any psychologist for therapy and counseling Connect with me through practo app All the best

Features are suggestive of late life depression .need medical management for the same to cure her symptoms

need further details.can contact me for the same