Possible Clues:

• Irritate brother or sister inside being ludicrous
• It's ridiculous, that's plain to see — there must be change at the outset
• Obvious having change of leader is ludicrous
• Relative overcome by pique — ridiculous!
• It's ridiculous, that's plain to see — there must be a change at the outset
• Absurd anger consuming brother, say
• Farcical, to be provoked over one empty barrel
• Bother about little brother? How absurd!
• Brother bitten by bug? That's ridiculous
• Droll