Following a nine-week trial, all three defendants were convicted of conspiracy to incite racial hatred.
Rosie Talland and Stephen Talland, both of Harlow, were also each convicted of inciting racial hatred.
Meanwhile, Robert Talland was also found guilty of possessing racially inflammatory material and two further counts of disseminating terrorist publications.
After sentencing, Det Ch Supt James Dunkerley, head of CTPNE, said the family had been part of a network encouraging “violence and extreme right-wing terrorism across Europe for decades”.
“Robert Talland dismissed the group as an ‘old man’s drinking club’, but through the gigs and events they organised, they promoted music which glorified acts of murder to audiences which included young children,” he added.
“In doing so, they encouraged attitudes of hatred, intolerance and violence which have no place in our society.”
Frank Ferguson, head of the Crown Prosecution Service’s Special Crime and Counter Terrorism Division, said: “Although people have the right to robustly communicate and exchange views, even when they may cause offence, the encouragement of terrorist acts and racist abuse are criminal offences.
“The members of this family created hateful lyrics and music as an attempt to incite racial hatred, encourage white supremacism and promote the use of serious violence.
“These were not idle fantasies but designed to encourage real world violence. Each of these defendants have received prison sentences for their hateful actions.”