AITA for “kidnapping” my sisters kids.Okay so me 36(f) and my boyfriend 38(m),have been trying for a baby for around 6-7 months.As it is our dream to have a family of our own.For a backstory,growing up me and my sister were very close.As if we were twins,But we both wanted kids and as she is now 40(f) and her husband is 50(m).Had their family first,2 beautiful baby girl twins,and a little boy.She had her twins when she was 20 and I was 15 turning 16.I was first excited to be an auntie but then she started asking for me to babysit more and even more I didn’t mind at first but then it was almost everyday I was babysitting.My social life was getting striped away from me at 15!After a few months of FREE babysitting..Thats when…Our big fight happend!We cut contact until she was 34 and I was 30,I sent a heart felt apology explaining why I said what I did,and asked to meet for coffee.She had kindly accepted. Sitting face to face for the first time in years.This was way out of my comfort zone but I thought to myself “It’s now or never”.Waiting patiently I wondered what would happen I hadn’t seen my nieces and nephew in years! Would she bring the Here??I see a person walking through the door.A flash of recognition hit me like a tittle wave.It was my sister.But more drained,As if she hadn’t slept in 5 years.I wave her over like good old times.We sat in awkward silence for a minute or two.A drained voice filled my ears,What I remember of my bright bubbly sister was gone..I ask what was wrong and she start spilling everything.Turns out her and her husband had been fighting.And he had been abusing her since they got together but she had felt like she couldn’t tell anyone.But had been trying to keep the family together.But it was to tough for her.Waterworks decided to join the conversation.Now that was 6 years ago. We had been chatting on and off staying intact like old family friends.She had kept her family together through everything and anything.My little nieces weren’t so little anymore they had cellphones now,Instead of the play phones I bought when I was 15 with my part-time job money.One night I was lying in bed,When the clock struck 10:45.A ring came from my phone it was my niece.I picked wondering why she was up at this time of night.”Hello”,a soft voice said,”Hii,Whats up?!”.”uhhh..Mom and dad are fighting”she said in a shaky voice.”c-c-can you pick us up?”.”uhh..Of course! Be there in 10 stay put in your room with your other siblings kiddo.love you!! My hands trembled on the steering wheel, and those were the longest ten minutes of my life. I texted my niece to go outside with her siblings. They hurried over, and I drove them back to my apartment. My sister called, asking where her kids were. We got into a massive fight, and she told me to "f**k off." AITA?