Drug addiction-advice

I'm looking for advice, it's not something I care to shout out on FB so I'm here because its anonymous.

About 1 year ago I got a call from home, my sisters ex who was looking to see if I heard from my sister. I told her I haven't for a few months, which was usual for us (we have/had a great relationship just suck at keeping up with each other)

She informed me that my sister has been into heroin and is worried about her and the people she hangs with. She said my sister had been lieing to my whole family to get away with this and no one is helping her back home. She said she is trying to get her back on path and she keep relapsing.

I didn't believe any of it.. I finally got ahold of my sister who said her and her ex gf got into a big fight and it was all the exgfs fault. I kept pressing the drugs issue and she finally confessed to doing it 3 times but hasn't done it in months. She sealed it with "I can't work and do drug tests with herion.." so I'm like.. makes sense, the ex was probably upset and lying, I've caught her lying before...

She stated calling me here and there to update but that's it.

Now... I messaged the ex to check on my nephew who she has custody of and she is telling me the same thing as she did a year prior.. my sister is on drugs and she is keeping my nephew away from my family for his saftey.

I called my Mom, my mom called my sister who said "I'm on parole and I get drugged tested weekly.. I can't be doing drugs or I get 5years in prison (i was told grand thieft 😟) I seriously have no clue if she is on parole or if she is even going to the appointments..

I'm 1000 miles away. I have no clue what's going on. I went home for a visit and she didnt even read my messages, completely ignored our text and calls, she knew my other sister and I was home to visit. I don't know her anymore and its scary. It seems like no one at home cares what she is doing. I have 2 young kids at home. I don't know how to help. I can't go home often or for long because I need to support my children.

I need advice before I bury my sister. 😢