So my dad came to visit at the weekend and lives around 5 hours away so I don't see him too often. I only saw him for one day and he spent the rest of the time visiting other members of family. My mum and dad have been split up for around 15 years and also live around 5 hours away from each other (my mum lives an hour away from me). During the last week or so I've only spoken to my mum on WhatsApp with general updates about the kids etc. I didn't mention that my dad was visiting as I didn't think it was relevant and would rather have spoken to her on the phone about it. She has since found out when she saw one of my siblings and is now annoyed as all her kids for not telling her that we saw my dad. I wasn't hiding it from her, it just didn't come up. She said she's disgusted at me and things will never be the same now which I feel is really unfair. There was no malice behind me not telling her but I also don't think I should be obliged to tell her. There's a lot of things in my life she doesn't know about until long after they've happened cos I don't see her often enough and only have a catch up on the phone every few weeks, normally it's me calling her. I want to repair this but don't think I should apologise so don't know what the best thing to do is. Was I wrong? Should I apologise and how can I make this better?