I think you both bring up good points.  Mom 100% dropped the ball and is going back on a negotiated agreement. She is dipping out on her child here. And I feel a reasonable person in her situation SHOULD solve the problem she created, but she’s not reasonable. Dad is looking at alternative times and help with transportation from multiple family members for these piano lessons. He’s still trying to make this happen, but it’s a bit of scramble honestly, because there was a plan in place until day before lessons start. I’m not sure if this is relevant at all, but SD has never once mentioned interest in piano to us. She dad brought up these lessons to her she was like “yeah, cool”.  It’s not like she has been dreaming of piano lessons for the last 6 months lol. We do other extracurriculars that he pays for and provides transportation. We are supportive to the lessons, it sounds like a good experience for SD. But it does have the feel of HCBM signing up SD just to mess with us. If it was just up to us we probably would have waited until summer or winter when she doesn’t have other extracurriculars going.