Act 1

• "It's a mug's game. The punter canny win."

  Billy is more realistic than Davie, and he's frank with him. Gambling will benefit the bookie, not Davie.
• "He'll get on a lot better if you screw the heid, right?"

  Billy is blunt with Davie - stability, not uncertainty, will help Alec to thrive.
• "Ah'll take it away wi me. Get it done this week."

  Billy, unlike Davie, is a man of action - he makes a promise and gets underway.
• "They catholics have made it bad."

  Billy is prejudiced, attaching negative connotations to the colour green because of his religious affiliation.
• "...there's yer yacht. A blue and white it is!"

  Billy, unlike Davie, fulfils his promise to Alec. 
• “ah had a word wi that bookie."

  Again, we see Billy's decisiveness. He cares about his brother and does what he can to help.
• "We never died a winter yet, eh?"

  Billy maintains an optimistic outlook in response to his brother's gloom.