You can only be as happy as your most miserable child... I have a 30 year old daughter living with me, and she is not quite right. She might be bipolar like me, but I am not sure. She does virtually nothing with her young children, but leaves it up to us to nurture them. My wife is upset, but I remind her that you can't change everything quickly and some things you can't change at all. We asked them to live with us because she was homeless, and now it is our job to take care of the kids. That's what we wanted, that's what we got, and that's what we have to accept.

I apologize for rambling, but my situation seems similar to yours. I also had another daughter and her two babies living with us, but she couldn't take it and moved away. Fortunately. In your case, I would do my best to accept the situation and help your children as much as you can. I know it is difficult, but that is your job right now.

As for being in a flat mood, that's all I get out of life, and I've accepted that too. Sometimes there is a little happiness, frequently there is contentment, but never joy. I'm ok with that.

Good luck.