Hillsong Church founder Brian Houston failed to tell police his father was a self-confessed child abuser and had a clear conflict of interest in dealing with the sex claims himself, an inquiry has found.

The high profile pastor gave evidence to the Royal Commission into the Institutional Responses to Child Sexual Abuse in October last year.

Hillsong Church founder Brian Houston failed to tell police about sex abuse claims. Credit:Janie Barrett

In a report released on Monday, the commissioners found that Mr Houston and the church's executive team failed the victim, known as AHA, who was molested by Frank Houston for a number of years from the age of seven.

When the allegations surfaced almost 30 years later in 1999, Mr Houston confronted his father, who admitted abusing AHA.