Hiya all I'm relatively new to this site so hope this is okay to put here. My nephew is 20 and has struggled with depression and anxiety since a young age (around 10/11). He went through a few years of bullying and mental abuse from his now estranged father between the ages of 5 and 8, after his parents divorced. He has been hospitalised 3 times over those years when his depression has got so bad he can't cope (although always of his free will and usually only for a night or two). He has also recieved support from professionals in the past. Although he still has regular suicidal ideations he has been so strong and resilient after going through so much and we are all very proud of him.
The last six weeks though he has began drinking to excess after falling out with a family member he was very close to for a long time. By excess I mean he is buying very very strong vodka online (at over 80% strength) and sometimes getting through half a bottle of it in a couple of nights, he's always liked a drink but only ever once a week etc before. Am I right to be worried or am I being unreasonable, and is there anything I can try to do or will it be seen as interfering with the free will of an adult?