I'm currently working in the US on a non-permanent work visa, and I have opened a small ROTH IRA. When I return to australia, what would my options be? Am I able to keep it?

Also, would I be able to keep my bank account and regular brokerage account? Would I have to file US tax returns for dividends and cap gains/losses while I'm not a resident, or would I incorporate that into my aussie tax return?

My adult son age 28 also will not speak to his family.
He won't talk to his father, his sister, or me, his mom.

My son has wisdom. I feel very connected to him even though he won't talk to me. I know that he would want me to choose my words wisely here in this post.

He will not tolerate bad choices. It's like he's my father and I'm the child.
I greatly respect his wisdom as my son. Yet... is he judging me with a lack of foregiveness?

Last January after four years of not knowing where he was or if he was in danger, he called me. The phone rang at the end of my prayer. He called because he was in crisis. Someone had strangled him and he told me he did not know how he was even alive.
I got to spend one day with him, but he locked me out again. He only had one pair of trousers and one shirt that he wore to work every day. He only had part-time work yet he is grateful to not be like me falling for the trappings of consumerism.. and I get that.

He must see that I have more growth to go before he will accept me in his life.
I also think he keeps us at a distance to protect himself from being hurt.
But also, I think it would help him to have a deeper personal relationship with Jesus. I pray that he is happy but how can he be if he cannot communicate with his family who loves him. He needs to forgive...
It has made me search my soul to see where I need to forgive and I'm learning from this pain.

Maybe his conviction is God's gift to me to open my eyes and my heart to righteous choices each day and be obedient to God's commandments.
I am so sorry for the hurt of divorce and not being under the same roof to be there for him growing up. I am bi-polar so his dad got custody and he could be very sharp tongued and unsupportive. My not being there really hurt my son growing up. Thank you for letting me post this. I hope it helps someone. I hope to live long enough to hear from him again.