I've managed to end up in a situation where I'm going to upset one of my children and I don't know how to resolve it. Basically, my older child (who struggles with mental health) has found an activity that she loves. It has been really positive for her and gives her an outlet where she feels she can shine.
Recently, her younger sister has started to show an interest in the same general activity and tonight she was asked if she would want to join her sister's group. She seemed a bit uncertain so I tried to explore what was holding her back, and she said she was worried she wasn't good enough. I gave her a bit of encouragement and she admitted that she would like to join, and has since got quite excited about the idea.
However, big sister then came to me really upset that little sister wants to join as she feels this is her 'thing' where she gets to make the family proud and that it would upset her if she had to share that with her sister. Part of the reason she was so upset was that she realises that it is selfish of her to feel that way, but that doesn't change how she feels.
This leaves me in a really difficult position - DD1 will be upset and consider quitting this activity which is her main form of stress relief/wellbeing support if DD2 joins, but if I don't let DD2 join she'll be disappointed, and I don't want to do that to her as she finds it really hard to ask for things so it's a big deal for her to have said she wants to do it. Any ideas how I can avoid upsetting one of them?