<human>: Hello Reddit,

Before my sister met and married her current partner, she was in a long term defacto relationship with another man. Their relationship started to wither when she left to pursue her studies abroad and during one of her visits back home, they conceived my wonderful niece.The long and short of it is that he wasn't ready for the responsibility. He was a pretty touch and go kind of dad, leaving the bulk of care taking to my parents.

Once my sister got settled, she came back for my niece, got married and had two other lovely children.

Lately, as my niece has gotten into her teens, she's began to notice differences between herself and her siblings. My eldest niece is takes the bulk of her genes from her father.

Last night at a family gathering, she gave me an odd look and asked " isn't it weird how I look nothing like everyone else? It would be so weird if I was adopted or something!". My niece also told me that she "didn't see her father's name" on her birth certificate. ( Don't even want to know how she found that)

Yikes. I've discussed with my sister the issue of her paternity; she' said she would tell her at 13 ( almost a year ago) and now, she isn't sure if it's the best decision to make.

I'm awkwardly stuck here as my niece is looking towards me for answers her parents aren't going to give. Her biological father at the moment has essentially relinquished his parental rights and I can't see him adding any benefit to her life.

On the other hand, my sister is potentially going through a break up with her husband and I've seen him singling out my niece ( he's been a good dad up until this point)

Can you give me the gist of the text in a nutshell?
<bot>: Niece is not the biological child of my sisters husband. She's asking questions, it's not my place to tell and I don't know how to explain without lying to her.