The former Australian pro rugby player who burned his wife and three kids to death was a dangerously possessive misogynist who was openly cheating with a string of other women, a relative has claimed.

Rowan Baxter, 42, stabbed himself to death in Brisbane after first killing wife Hannah Clarke, 31, and their children — Aaliyah, 6, Laianah, 4, and Trey, 3 — by torching the car they were in last Wednesday.

Now even his relatives admit that he was a vile misogynist who struck “fear” into the family because of his “dangerous sense of possession” over his wife and kids.

“Rowan has been raised … to think that women are two things: to be the house cleaner and to be a prostitute,” Baxter’s cousin Sandra Taylor told Australia’s 9News, blaming his “father and his father, and it goes onwards.”

In another interview, she claimed he was also openly cheating on his wife.

“We were at a family barbecue and he was at the grill and I walked over to him and he was sending hundreds of texts to other women,” Taylor told Daily Mail Australia. “I know Hannah believed she wasn’t the only one.”

Taylor — Baxter’s first cousin on his mother’s side — said that even she was left terrified when she reached out to support Clarke when she first left Baxter, whom the terrified wife later accused of stalking her.

“It was just fear, complete fear,” Taylor, 45, told 9News of how her own cousin made her feel.

“He was continually walking past my store,” she said, adding it was the same shopping area where the wife he would kill also worked.

She told Daily Mail Australia that she was “shaken” by the horrific murders, but insisted they did not “surprise me.”

“This was a man with a level of hatred and disrespect for their mother so great that he would make this choice — the most horrifying and despicable of choices.”