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Ros Lai is the daughter of an unknown Jedi Knight and the Nightsister Queen Zalem.
While her father was the user of the Light Side of the Force although, her mother was on the Dark Side of the Force.
Ros Lai was also Force sensitive and had the abilities of using Force.
Her mother Nightsister Queen Zalem killed her father in her childhood.
And the death of Nightsister Queen Zalem came from the hands of Ros Lai in a mission of Quinlan Vos to stop Zalem to open the Infinity Gate.