I started to read the article with a bit of a "critical" eye for evaluation and found comments such as "once they see that person being physically violated to this kind of an extreme degree, will realize that there might be a hole in that persons hedge." Honestly, there is no biblical foundation for this, and no scripture is cited in the article. Demonic activity in the life of a believer is limited to his desperate attempt to deceive you into believing lies, and tempting you to sin.
I do not believe "generational sins" are demonic in nature. I believe they are passed from generation to generation through the normal enculturation process - what we teach our children through values, how we treat our children, the things we say to them, how we teach them socialization, etc. Iow, if a man beats his wife, their children will believe that is a normal part of marriage. If you expect your oldest child to rear their younger siblings, this will have severe consequences in that they will be caretakers and rescuers (unhealthy) and their siblings will grow up with a different set of issues like entitlement or attention-seeking.
I believe almost all generational sins are passed along through unhealthy patterns of relating to each other and to God. Once a person becomes a believer, it is imperative to go through a healing process where there is discipleship leading to the transformation of the heart and mind into the heart and mind of the Lord Jesus (it is no longer we who live, but Christ who lives in us). There is a fantastic program that deals with these kinds of things - even/especially generational - called Freedom Session.
Stand Strong?Walk in Truth - Freedom Session International Ministries. I really encourage you to check this out. It is truly liberating. In one of the later sessions, the issue of demonic attachment is addressed. I am very familiar with the program (have been facilitating for 5 years) and I have also got a background working with [at-risk] families. If you have specific questions, feel free to PM...there are also people here with good intentions, and it's important for you to follow what you know to be true, given prayer and biblical study.