While on the train to Hogwarts, what rumor did Rose reveal to Albus?

That Scorpios was the son of Voldemort.

Explanation:

they viewed themselves as vigorous and engaged.

In "Revolutionary Tea," the problem of taxation between England and the colonies is exemplified by discussing the example of a mother and daughter. The mother is a symbol of England, while the daughter is meant to represent the colonies. The girl is described as "bouncing," which implies that she is vigorous, determined and engaged. This is likely a representation of the colonists' opinion of themselves.