[Closed] are you the type of person who can forgive?

Tough, as is often the case the cover up is worse than the issue.

All your questions are legitimate and deserve an answer. You have been "wronged" and are entitied to an explanation.

A couple of thoughts ... it's not that an uncommon situation, as I read it the real kick in the teeth is being told last, as a typical bloke I could imagine my mum would find it easier to share stuff with my sister than me, maybe a "good opportunity" never came up, time rolls on etc ...

Your mum is '78 .. have a chat, ask her all the questions, try and get it sorted out not just for her sake but yours too.

Best of luck