Over protective I guess

I might be over protective but I just found out that my mother, the woman who dealt with an alcoholic and drug addict for 18 years, has tried weed I DONT CARE THAT ITS NATURAL I really don't care so please don't comment saying that cause I know it's all natural but so was tobacco at one point and then people started throwing stuff into their tobacco. Anyways I never would have thought she would have tried that but then again she's been going out drinking and last night admitted to me that she probably shouldn't have driven home last night cause she was a little too intoxicated...really? At this point the only person in my family who hasn't done anything illegal is me and my grandmother so now I'm at the point where I don't want anyone to baby sit for me anymore except my grandma I really don't care if I'm being over protective or not but I worked really hard to live a life that my children could look up to and I feel like the more I learn about my family the more it seems like my hard work was for nothing cause my son will grow up seeing it in the family I just want him to live a long healthy life and to be successful and not get caught up in something that would ever hold him back I don't know what to do or how to handle this overwhelming feeling of wanting to protect him from everything I don't think I'll be able to handle this