Castor and Pollux

I like to read Greek mythology
i came across a sentence stating

"Those who harm Pollux can never be safe from Castor"

i wondered who these people are and gave a Google search
and found who they were

"Castor and Pollux were the offspring of Leda and the Swan, under
which disguise Jupiter had concealed himself. Leda gave birth to
an egg, from which sprang the twins. Helen, so famous afterwards
as the cause of the Trojan war, was their sister.

When Theseus and his friend Pirithous had carried off Helen from
Sparta, the youthful heroes Castor and Pollux, with their
followers, hasted to her rescue. Theseus was absent from Attica,
and the brothers were successful in recovering their sister.

Castor was famous for taming and managing horses, and Pollux for
skill in boxing. They were united by the warmest affection, and
inseparable in all their enterprises. They accompanied the
Argonautic expedition. During the voyage a storm arose, and
Orpheus prayed to the Samothracian gods, and played on his harp,
whereupon the storm ceased and stars appeared on the heads of the
brothers. From this incident, Castor and Pollux came afterwards
to be considered the patron deities of seamen and voyagers (One
of the ships in which St. Paul sailed was named the Castor and
Pollux.and the lambent flames, which in
certain sates of the atmosphere play round the sails and masts of
vessels, were called by their names.

After the Argonautic expedition, we find Castor and Pollux
engaged in a war with Idas and Lynceus. Castor was slain, and
Pollux, inconsolable for the loss of his brother, besought
Jupiter to be permitted to give his own life as a ransom for him.
Jupiter so far consented as to allow the two brothers to enjoy
the boon of life alternately, passing one day under the earth and
the next in the heavenly abodes. According to another form of
the story, Jupiter rewarded the attachment of the brothers by
placing them among the stars as Gemini, the Twins."

Greek Mythology has lots of bed time stories
isn't it?
i like Hercules the most and then Aeschylus