The father, who cannot be named to protect his victims’ identities, brainwashed his victims by acting as a mystic who sent them emails telling them what to do.
Prosecutor Jon Hipkin said: ‘The defendant systematically controlled, groomed, and brainwashed his victims so their will was completely over-ridden by him.
‘The defendant used his control over his daughters for his own sexual gratification and did what he wanted with them.
‘There were even elements of witchcraft and mysticism to the control with the defendant creating a false mystic who was in communication with the females and who told them to sleep with the defendant.’
The man also organised the rape of one daughter by his friend, as he watched. DNA tests revealed he had fathered at least six of his own daughter’s children – and went on to abuse one of them.
In a victim impact statement read to the court, one woman said: ‘This man was supposed to be my father.
‘He made me live in fear continually while growing up. He made me feel so small in a big world.’
Judge Paul Thomas said: ‘What you did to your family over a period of 20 years plumbed the depths of depravity. It was totally evil.
‘You sexually abused and raped three of your daughters. One of those daughters was biologically your granddaughter.
‘You took advantage of their extreme vulnerability caused by their age and circumstances and abused them cynically, mercilessly, evilly.
‘In short, you are as cowardly as you are wicked.’
He denied 36 counts of rape and one count of assault by penetration but was found guilty by a jury.
The father was given an extended sentence of 40 years.
He will serve at least 22 years before he is considered for release.
Hayley Fackrell, from the CPS, said: ‘These sickening acts of abuse were carried out by a person that was supposed to protect and care for the victims, but instead he systematically controlled their lives, grooming them for his sexual gratification.’
