Emmerdale spoilers follow.
The drama begins when Aaron starts to goad Billy after the kids argue about a playground fall.
Following this, a careless word from Paddy Dingle in the vets leads Billy's wife Dawn to find out the truth about the previous day's playground confrontation. After she gets home, Dawn demands to know the truth from Billy.
Unfortunately, this isn't the end of the issue, as the fallout between Billy and Aaron continues, while Dawn is preoccupied by the baby shower that Gabby Thomas has arranged for her.
When an angry Aaron goads Billy again, a fight ensues, and Will Taylor is forced to break the pair apart.
Dawn is severely unimpressed when a battered Billy arrives home, annoyed that he has allowed Aaron to provoke him into a fight.
Later on, Dawn attends an antenatal class, but the discussion about pain relief drugs leaves her concerned, due to her past battles with drug addiction.
Meanwhile, Kim Tate soon gets involved in the bad blood between Billy and Aaron. Will she manage to bring the feud to an end, or is the trouble just beginning?
Long-time Emmerdale viewers will remember that Aaron and Billy have a fraught past, due to Billy having made Aaron's life a misery while they were in prison together several years ago.
Billy isn't the only villager getting on the wrong side of Aaron, though, as actor Will Ash, who plays Caleb Miligan, has hinted that his character could be a new enemy for Aaron.
"Caleb and Aaron really brush up against each other in a bad way," he told Digital Spy and other media, adding that Caleb's feelings of protectiveness over his sister - and Aaron's mum - Chas Dingle make him take "a dislike to Aaron".
Emmerdale airs on weeknights at 7.30pm on ITV1, and streams on ITVX.
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