My parents never try to reach out or have a relationship with me?

If I were your parents, I would accept full custody of the minor children and I would eject your sister out onto the front lawn and tell her to disappear.

Any woman who prefers drugs to keeping her own children isn't worth the powder used to blow her to hell.  And I wouldn't want her anywhere near her own children to be influenced.

But it seems your parents haven't done that?

Why do they want this drama in their lives?  Can it be that the drama is more fulfilling to them than a relationship with a child who has done well and is independent and highly successful?

At your home, there is peace and happiness,  You live independently and successfully and you don't need to be "rescued" like your sister does.  It seems you make far better choices, too.  You've got a good and solid future planned.

Some people prefer self-inflicted drama and a need for constant chaos.

I prefer a well ordered life.

I would be proud of you.

Here's what will happen.

They will only contact you when they want something.

They think they are in control, but they are wrong.

Let me tell you a story. 

Besides all the abuse I grew up with, when I was in high school my mother made the mistake of saying she was going to tell my kids how I acted, suggesting that I was the problem.  Right then I decided that she was never going to see my kids.

My daughter is nearly 30 and has never met my mother.  I've given her the choice, but she has shown no interest.

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they might be too busy cause of the kids

Keep reaching out. Their own lives sound difficult and chaotic and you are a grown up.