Mary Lowry's son has described murder accused Pat Quirke as "in control most of the time, grumpy some of the time" and said he went around his mother's farm "as if he kind of owned the place".
Giving evidence at the Central Criminal Court, 19-year-old Jack Lowry spoke about his mother's relationship with Bobby Ryan and his memories of the accused.
Mr Quirke (50), of Breanshamore, Co Tipperary, has pleaded not guilty to the murder of Mr Ryan, a part-time DJ known as 'Mr Moonlight'.
Mr Ryan went missing on June 3, 2011, after leaving girlfriend Ms Lowry's home at about 6.30am. His body was found in an underground run-off tank on the farm owned by Ms Lowry and leased by the accused at Fawnagowan, Co Tipperary, in April 2013.
The prosecution has claimed Mr Quirke murdered Mr Ryan so he could rekindle an affair with Ms Lowry (52).
Mr Lowry told prosecution counsel David Humphries BL he lived with his brothers and mother in Fawnagowan until April 2013. His father had passed away in 2007.
Following his father's death he remembered Mr Quirke leasing the family farm from his mother. He knew all of Pat's children and got on well with Alan, who died in a tragic farm accident in 2012.
When he was younger he got on with Mr Quirke, he said, adding: "I have nothing against him."
He later said Mr Quirke was "in control most of the time, grumpy some of the time. He went around the farm as if he kind of owned the place".
He recalled going with his mother and brothers to Portugal and Spain with the Quirkes. They rented a villa with a private pool and all got on, he said.
When his mother started seeing Bobby Ryan the witness "felt weird about it" at first and used to "slag him off about being bald". He said he thought Mr Ryan was taking over his father's role.
He also remembered Mr Ryan taking him and his brothers to Tramore, Co Waterford, where he took them on carnival rides and into the arcades. His mother and Mr Ryan seemed happy together, he said.
"My mother was happy when he was around," he added.
The day Mr Ryan went missing the witness remembered coming home from school and seeing his uncle Eddie, which was strange. He found out Bobby was missing but doesn't remember who told him.
He didn't know of the tank where Mr Ryan's body was found but had previously noticed the concrete slabs that covered the top.
Under cross-examination he told Lorcan Staines SC, for the defence, he could not remember what happened when he spoke to gardai in 2011.
He said he spoke to gardai again in February this year after a garda approached him to make a statement.
He has no memory of Mr Ryan calling to the house on June 2, the day before he went missing. He said he also has no recollection of ever going to his grandmother and complaining his mother was not home.
In re-examination Mr Humphries asked the witness if he remembered ever being left unminded at home and he replied that his grandmother, Rita Lowry, was always there.
The jury was told that the prosecution evidence is likely to finish today and the case will formally close tomorrow.