In their 50's and still not at peace. My niece was convicted of a felony and did time. My nephew was convicted of a felony violence and DUI, which is really stupid. Because he actually died of a heart attack from alcoholism, and was brought back. He needs to drink like he needs a new hole in his head. I let the niece come from Calif to Texas, where I live, to start a new life. She was here 2 days, had a panic attack, turned around and drove back to continue living as a parasite off her mother. At first, I was very angry about it, but after a while I resigned to the fact that she is simply not ready to do the work and self-examination to really change her life.
About 20 years ago, a very high lama told me not to tell people about Vajarayana and the secret mantrams and visualizations associated with that practice. Vajrayana is secret, because it needs to be taught by a well-qualified and authentic teacher. You can find all sorts of info and books on the internet about vajrayana, but they won't do much good without someone really wanting to know and an authentic teacher to teach. People, especially Westerners, will not understand it and get all kinds of crazy ideas about it. That old lama told me that people have to ask for teachings before they are given. That way, we know people are ready to begin a practice. And that's why Buddhists don't proselytize. People have to be ready and ask for teachings.
You can tell your nephew what practicing meditation and contemplating dharma teachings have done for you. You can even suggest that he also might find meditation helpful to calm down, when he gets upset and angry and needs to get a handle on his self control. But of course, you can't meditate FOR him, and you can't twist his arm to make him meditate. He has to want to do it for himself.
If you are a member of a Buddhist sangha, you could invite your nephew to attend its social functions, like a picnic or dinner, or a walk, of your sangha, so he can meet and interact with other Buddhists. No pressure to participate further. Just the warm loving embrace of people, who may say just the skillful words to ignite a little spark in his mind to want to live a more happy life. You have to be prepared to endure embarrassment, if he goes off the reservation and starts acting out. But it seems the most important thing is for you to stay centered and practice maintaining a calm abiding mind. When I get freaked out and scared, I recall the beautiful face of the Karmapa, who manifests to me as the perfection of calm abiding.
I find this Buddhist prayer of the Four Immeasurables to be quite helpful to remember my aspirations.
May all sentient beings be liberated from suffering, and the causes and conditions of suffering.
May all sentient beings be happy and have the causes and conditions of happiness.
May all sentient beings never be separated from the joy and bliss of no more suffering.
May all sentient beings be free from attachment and aversion.
Cheers 
Edit history
= new reply since forum marked as read
