Did they start with weed or with cigarettes and alcohol?
Intellectual honesty goes a long way toward making your case.
One is a total rebel, she probably did start with cigarettes and then weed because she could get it from an close older relative who really was the proverbial pot head. She has long since graduated from weed and booze and is into crack, meth, heroin, whatever she can get and is having her fifth addicted baby, which she farms out to relatives to raise. She will sell herself for a hit and live in filth.
The other one from what I have heard from friends and other relatives and just talking to him started with weed. It was his drug of choice for years and he gave it initially to the rebel female relative. He is older than the total rebel but they have taken to running together so if it will get them high they use it. If used cat litter would get them high they would snort, smoke, eat it or inject it at this point. It’s really sad.