The scenes between Hal and Thomas in The King had such a strong Sirius and Regulus vibe
When their father says Thomas is going to be King and not Henry = When Sirius was kicked out
That scene on the battlefield = Sirius trying to reason Regulus that the Death Eaters/their parents are crazy and not worth dying and killing for
When Hal learns of Thomas death = probably the reaction Sirius had when he learned about Regulus' death











