The key (2)
strixvanallen on May 28, 2017
Younger siblings will feel justified in their suspicions that parents overstate the elder sibling's morals and accomplishments.
Elder siblings can hear the faint but present disappointment in Tom's speech bubble in the second panel.
Spikes at 1:41PM, May 29, 2017
You can hear the underlying, "And DON'T tell mom I gave you that."
strixvanallen at 7:27PM, May 29, 2017
"If you tell, I might have to share a few things I know about you, little lady."