Three of them - Amanda, Catherine and Vicky Tweed - met with Sunday World reporter Nicola Tallant to produce a Crime World podcast about their paedophile father.
"We wanted to set the record straight. This man was much more than a sporting hero and a loyal DUP and TUV politician. He was a predatory paedophile and a violent thug who smashed our mother's face to a pulp," said Amanda Brown, who was Tweed's stepdaughter.
Tweed (62) was killed in a collision while driving his motorbike in north Antrim last month.
Tweed's daughters - who range in age from 22 to 41 - were determined to speak out to inform members of the public who may have believed Tweed was a pillar of the community.
"By doing this podcast we will leave a permanent record about the real Davy Tweed," said Catherine (29).
Amanda Brown became Davy Tweed's stepdaughter when her mum Margaret married the sporting legend in 1984. But from around the age of eight, she was sexually abused by her stepfather who physically threatened her not to tell anyone.
When her sisters and brother came along, Amanda felt - wrongly as it turned out - that if she changed her name to Tweed, then perhaps the abuse would stop.
"I thought if I became Tweed, then I'd be okay. But I was wrong."
She added: "We just branded him the 'Tweedophile'."
Catherine struggled to hold back tears as she recalled the abuse and physical violence she endured as a child at the hands of her rugby star dad.
"It was horrendous," she said.
And Catherine also challenged those who praised him after his death to look again at the facts.
"I can see why people thought he was a great man. It was his charm and public persona which allowed him to get away with it for so long.
"But the aggression he showed on the pitch he also brought home to his family. All of us and our poor mum were subjected to his brutal violence and temper," she said.
Victoria Tweed (26) said she hoped that by speaking out so publicly, she and her sisters would encourage other victims of sex abuse to come forward.
"As a family we stuck together and we all give each other strength when we needed it," she said. "We want anyone who is suffering to speak out."
In 2009, a case of child sex abuse agaisnt Tweed involving 10 charges collapsed. But in 2012, he was convicted and handed an eight-year sentence for gross indecency, indecent assault and inciting gross indecency, spanning an eight-year period.
Four years later the conviction was quashed over issues surrounding the bad character clause in the judge's summing up. He was buried in Dunloy Presbyterian Churchyard, Co Antrim two weeks ago.
Nicola Tallant's Crime World podcast will be available on the Sunday World website next week.