Advice desperatly needed... :(

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Hi everyone! I would really like to have your advice on a dilemma that has been tormenting me for a while now. My sister, who is 4 and a half years older than I am, treats her daughters badly. I know it is my opinion, and probably that she thinks that she is raising them properly. I always thought she, like me, would never do anything to hurt her children, since we share a past full of deceit and suffering. Our mother played a big role in that. She was never there for us, and our stepfather did all he wanted with us. As of today, she has two wonderful daughters, and is pregnant with a little boy. At first, when the second girl wasn't born, everything was going fine. My niece was the little angel, in the family. After my sister's second daughter was born, everything changed. My sister (I will name her Sonia for the time being) started to be less attentive to her eldest daughter's needs. I know it is difficult, since a baby requires a lot more attention than a child, but still... Things didn't get better. Worse, I'd say... The more time passes by, the more Sonia hurts her eldest. She keeps yelling at her everytime the girl gets near her little sister, even if she only wants to show some affection to her. The girl reacts very badly to this. The more Sonia yells, the more my niece becomes angry and aggressive. I can see that she doesn't like her sister very much, but I can't blame her. Plus, it is also obvious that she is terrified of her mother. Every time Sonia walks in a room where she is, I see her shoulders crisping, her eyes immediately fix the ground and she moves discretely as far away from her mother as possible. I know for sure that Sonia doesn't beat her physically, it's more emotionally that she tortures the poor girl. Doesn't she see that she is walking in the footsteps of our mother, and that in the end, it is her children who will have to pay for it? I really don't want my nieces to go through what I went through, but how can I possibly say something like that to my sister? The father of my nieces, my sister's husband, never wanted kids, unless it was a boy. So he doesn't take much care of them. And Sonia, whom does all she can to please him, is pregnant with a boy. What will become of her daughters when that little boy is born? If they were hard on the eldest when the second one was born, I can't imagine how it will be for them once their brother arrives... As if it wasn't enough, another problem comes in... I haven't mentioned the worst detail yet. About two months ago, I found out from a trusted source that the father was cheating on my sister. He may even have put one girl pregnant... Of course, my sister knows nothing of this. She is almost obsessed by him,, she idolizes him, and she does all in her power to please him, and that's his way of thanking her! So here is (after this very long message) my questions : Should I talk to her about her relationships with her daughters? About the fact that she is mean to her eldest, and that she is acting just like our mother did with us years ago? And if I do so, what happens if she just answers to mind my own business? My last question is : Should I tell her that her husband is cheating on her? Knowing my sister, if I do, she'll leave him and get divorced. But if she does that, I know the kids will suffer a lot from it. But is that what is best? I thank you a lot for your answers. I really need your advices, since I can't go on pretending everything is fine anymore. I just can't...