Rolf Harris said "it takes two to tango" when confronted with claims of sex abuse, the brother of one of his alleged victims has told a London court.

The alleged victim's brother said he was very angry when his sister told him Harris had abused her since the age of 13.

The woman, now 49, claims Harris first abused her as a 13-year-old and regularly assaulted her for the next 16 years.

The court has heard that Harris will admit to having a sexual relationship with the woman, but that it began when she was 18.

Her brother said he phoned the Australian entertainer - a family friend - and confronted him with the claims and threatened physical violence.

The man told the court Harris responded by saying "it takes two to tango".

Harris, 84, is on trial charged with 12 counts of indecent assault against four girls between 1968 and 1986, the youngest of whom was aged just seven or eight at the time of the alleged offence.

Harris denies all the charges.

Mother tells court she trusted Harris

The woman's mother told the court that she noticed Harris came to their home more often after a holiday her daughter took with the Harris family when she was 13.

It was during this trip that her daughter alleges Harris began to abuse her.

Her mother said Harris would ask where her daughter was and go upstairs to see her.

She said she did not really question it because she trusted Harris.

She admitted in court, however, that she did not have much in common with Harris and had once described him as boring.

The trial continues.