My sister is a mother

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of two beautifull children a four year old girl and a two year old boy. Last year we found out that my sister had a tumor in her brain. Since this revelation things have NOT been the same. I'm not sure what this tumor is doing to her common sense but things have been strange. Before this all happened my sister ended up leaving her husband because he was doing drugs and took her kids and started to get her life together which was great. She then met this guy named Joel and they were together for two years the kids were even calling him Daddy and then she found out about the tumor and then things got weird she left Joel for no reason and decided that she couldn't work even though she was working just fine before finding the tumor. Since then she has gotten together with a 38 year old with no job no home and no car who was using her for her disability money and he was doing drugs and she thought that was okay. She did end up kicking him out THANK GOD but now she text me and told me that she let her Four year old daughter move in with the kid's father. Now i have recently seen him and he is looking like he DOESN'T do drugs any more but what i can't understand is why any mother would give up their child. I just don't get it being a new mother i could never give up my child not to anyone i wouldn't give a crap who it was too i just wouldn't be able to do it. I'm worried that my sister doesn't love her child the only reason for her letting her daughter go to her father is that her four year old WANTED to go. But shouldn't she be thinking about what the best thing is for her instead of giving her what she wants. I'm worried and there really isn't a damn thing i can do about it. grr