Pierce Brosnan gave his sons "very little advice" as they worked together on the new movie The Unholy Trinity

Pierce told People magazine: "I gave very little advice, and they asked me for very little advice. I think both men knew instinctively what to do: Show up on time, know your lines, and be brilliant. Be relaxed, and have fun, and go play."

However, the former James Bond actor was less impressed by how untidy his sons were in the motor home they shared during the snowy production.

Brosnan said: "It was winter, the snow was coming in, they didn't wipe their feet. Just the old common sense, 'Wipe your feet, take your boots off, for God's sake!' You know?"

Pierce revealed how Dylan and Paris grew up on his movie sets as they travelled the world with their parents at the height of his movie career.

The star - who also adopted his late wife Cassandra Harris' (who passed away aged 43 in 1991 from ovarian cancer) children Chris, 52, and Charlotte - who died from the same disease as her mother in 2013 at the age of 41 - recalled: "We always stayed together tight as a family during the days of James Bond.

"(Dylan and Paris) have been on the road with me since they were tiny. Keely and I took them everywhere with us around the world."

Paris explained that he and his brother's appearance in the movie "organically came about".

He said: "It kind of naturally and organically came about. There were some little opening for us to get in there and dip our toes in the water."

Dylan, meanwhile, wasn't concerned about how much screen time he got as he embraced the chance to act alongside his father and brother.

He said: "It was just really nice to go spend time with Dad and Paris and be a part of that."