I agree with the point brokenheartfool made, it could be that the nonartist daughter is feeling left out or unappreciated or feels that you favour artist daughter?
My brother is the mess up, I suppose I'm the sensible one. I'm seen as being together, not needing support, being strong, whilst my brother messed up time and time again and my Mum bailed him out, making herself sick with worry in the process.
Every time I saw her our conversation would be about him, every visit, every phone call would revolve around what he was doing...even when he ended up in prison for fraud he was still the injured party, still fussed over and pandered too, sending him money every week, spending her whole weekend visiting him but breaking plans with me every time she was too tired.
She would ring me, I would ask how he was and then I would spend an hour listening to her worry about him, feeling sorry I had asked but feeling that I had to ask to be polite and to show concern otherwise I was labelled "cold".
It drove me mad to be honest. To see my Mum so upset, so "codie". Perhaps a little jealous too that nothing was ever about me because I didn't need help. It was like you almost had to be an f-up to receive any support.