My mum and I are quite close. We get on well and live a 15 minute walk from one another. I have a child free day off on my own this week and as she doesn’t work, I asked if she fancied going for some lunch. She said no as my stepdad is off work and they might decide to do something together. This happens constantly. We do a yearly big shopping trip near Christmas and it’s always difficult to decide the date because we need a day I am off work and my stepdad is at work. They’ve been married for 2 years now and this drives me insane. There is no expectation in my own relationship that if we’re both free, we mustn’t make plans with anyone else so it's a weird one to get my head around. Sometimes I'll feel one day when my mum isn't around anymore and that while she is around, I want to show how much I love and value her. Am I being unreasonable to feel a bit miffed?