i understand the situtaion and hve been in 1 similar...my moms boyfriend used to grow bud under neath the porch when i was younger...i mean alot of pot...like 50-75 plants twice a year...and then would sell it...my mom knew but let him do it...even though it put me and my sister (which was his daughter)at risk...evetually they brake up...so my moms single now and...and when i was 14 my mom caught me with weed...she called the cops over a fuckin dime bag...and i got put into rehab and probation when i was 14...fucked up...

point being...ur mom might know that he does it and accepts that but maybe she doesnt elt u do it cause she expects more from you?...i dunno im just saying theres a chance she knows...

if she doesnt then hopefully when she find out she kicks the fucker out...if not then ull be shunned untill u move out by him...