Brothers extended their purple patch of form to take another big step towards locking in a finals berth.
It shaped as a massive local derby with Kangaroos coming into the clash off a win over Gundagai, but it was Brothers who dominated for long periods of the game.
They ran in six tries to one to maintain their grip on fifth position.
Coach Peter Little was thrilled with the 36-4 result at Equex Centre on Sunday.
Especially with their defensive effort.
It took Kangaroos 71 minutes to score, and they needed the advantage of having Cade Price sin binned to do so.
"Our defence has been the real telling part and just being there for each other," Little said.
"We are backing ourselves in defence.
"At the start of the year we were fighting a lot amongst each other but we've turned that around, it's a lot more positive and I'm really happy."
Coach Glenn Dumbrell thought the side struggled to back up their massive win last week.
"As a group we didn't turn up to play winning football," Dumbrell said.
"It's just plain and simple.
"We just thought it was going to come and it obviously didn't so it is a learning curve."
Brothers opened the scoring after 11 minutes after Little was able to create an overlap for Harold Kirby to score.
They doubled their advantage following a one-on-one strip from Little as Jordan Little went over to score.
Price then went the length of the field to score with 16 minutes left in the half to hand Brothers a 18-0 lead at the interval.
The Brethren continued to fire in the second half, first with their defence and then on the scoreboard as Harold Kirby went over for his second 10 minutes into the stanza.
Mitch McCauley ensured he had a first grade debut to remember as he scored with his first touch about 20 seconds after coming onto the field.
Kangaroos finally for the on board when the spread it wide to Nick Trevaskis but Brothers responded again as James Hay crashed over to seal the win.
All bar Hay's tries came through the back line and with a couple of injury problems in the forwards it's a ploy Brothers have been developing.
"We have to move the ball around to make us more mobile around the park," Little said.
"We just can't play out the middle against some of these bigger teams so we try to move them around and it's working well."
The win sets up a big clash against Gundagai at Anzac Park on Sunday.
Brothers have only lost once since being well beaten by the Tigers earlier in the year.
Little believes it will be a real test of where the team is at.
"They are the pinnacle - Gundagai and Southcity - and they are the teams we need to beat," he said.
Kangaroos tackle Temora.