Dude... I made it through the first ridiculous statement, only to gag on the second:

"Also as you know there are some cases where the mother or father are alcoholic for example but the son no?"

Ever heard of "Fetal Alcohol Syndrome"????
http://www.lpch.org/DiseaseHealthInfo/HealthLibrary/genetics/fas.html

Mothers with addictions to substances like methadone, cocaine, heroin etc have been known to pass their addictions on to their offspring:

http://content.nejm.org/cgi/content/abstract/313/11/666