Thanks CANDC
Coming to this forum was borne out of frustration with my mother's attitude. Have posted under title of degenerating relationship with my mother. Then there was the incident with my sister-in-law.
The amazing friend who I posted about in opening this thread has opened my eyes to a lot of things. As have the many contributors to my other threads. Lots of people think their problems are unique to them then realise they are not alone.
Will check in with my aunt tomorrow. She, amongst others, have wondered if it's early onset of dementia with my mother. I don't think so as she's always been difficult. For as long as I can remember, she's always had low self-esteem and possibly a persecution complex.
Haven't read my friend's e-mail today, so that is the next job. Like everyone's support on here, it will serve as a source of comfort and inspiration in the days, weeks and months to come.