Matigo.
You are seeing this from your point of view as a 'son', meaning that is how you want your parents to treat you. Once you become a parent you will see everything differently. I have never smoked weed nor will. Hell, I become angry when my younger brother swears even though I do it all the time, it's just not cool. Before you call others autistic etc, become a parent and look how differently you would've seen it, I doubt you will ever enjoy your son or daughter smoking weed, especially in front of you. As you said, you are becoming a parent in 7-8 months and then you will realize all the wrong facts you've written on here as being a non-parent. You will have a bigger responsibility and care for your child, trust me. I may be wrong it all depends on how 'you' are, but you should never be a hundred percent certain. I hope you and your up-coming child will have a decent life, good luck!