I gather that it's speculative, based on the experiences of exorcists who have dealt with these things.  There's certainly nothing against Catholic teaching there.

It's the common theological opinion that not only do individuals have guardian angels, but entities united under God, such as family joined in two validly-married spouses, along with their children, or even countries, or other organizations, have guardian angels.  At Fatima, Our Lady referred to the Guardian Angel of Portugal.

So, conversely, there's nothing to preclude various evil spirits from latching onto (and being assigned by the devil to torment) a particular family or family line.  In fact, I consider this likely to be true.

I also believe that it's reasonable to assume that the diabolical attacks are more concentrated around Traditional Catholics.  So few people have the faith today, and so many have willingly given themselves over to error and also to the immoral ways of the world, that the number of demons are free to concentrate their efforts on the remaining Catholics out there.  They needn't waste their time on these others.  So instead of being able to muster one or two demons to attack a Catholic family in days of old, they may have hundreds or thousands available to take on the job.  That is why it is more important than ever to be devoted to Our Lady and the angels, to use Holy Water, Blessed Salt, and Sacramentals.  I think there is great value in the book Deliverance Prayers by Father Ripperger.  I have seen violent (clearly diabolical) attacks on many Traditional Catholic families.

Of course these demons have no power over any baptized Catholic, per se, but it takes just a little bit of letting our guard down before they're waiting to swoop in.  More than ever we need to say the St. Michael prayer and pray to our guardian angels.  And it makes sense to pray to our family's guardian angel to help against any such generational spirits who might be attacking our families.

It is important to not get to the point of seeing a demon behind every bush, though.  There are other sources of evil in the world, such as the world and the flesh, and the effects/consequences of one's sins and other bad choices.  Yet the war of demons against human beings is quite real, totally backed up by Church teaching, and there's nothing (other than God's will) that would prevent demons from latching onto a family.

I looked for official teachings on this subject a long time ago but could not find anything authoritative. I know that as a child, I was taught basically the same thing as Fr. R preaches, albeit without all the details. IMO, it is somewhere among those things traditional but unwritten which have been handed down from generation to generation. 

http://drbo.org/cgi-bin/s?q=sins+of+the+fathers&b=drb

You have to keep in mind that if a particular sin is brought into the family line, then that demon can linger around and afflict a family until it's hold is broken again by someone with authority. Once you commit certain mortal sins, you give the demons a certain foothold or authority over you, this carries on until a certain level of holiness is achieved or binding prayers are said.

He explains it all his talks, and clarifies some questions in his interview with Ryan Grant here:

Not sure why this is confusing, it is definitely a reality. Just look at a family like the Rothschilds or Rockefellers, talk about family demons.

Is the generational sin the same as the generational spirit(s)? What spirit binding prayers would you recommend? 

So, in my case it would be my children for example. How about my husband's addictions or my marriage?

Is this it?

https://www.amazon.com/gp/product/154105671X/ref=as_li_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=154105671X&linkCode=as2&tag=httpwwwchanco-20 />

Yes,
And again, you have no authority over your husband. You can pray for him, but not use binding prayers on him. You can use them on your children though.