Valentine is his sister, so yes. But not in a romantic way.
Demosthenes is a pseudonym used by Valentine Wiggin, one of the main characters in "Ender's Game." She uses this persona to write political articles and gain influence in the online community.
Ender's sister Valentine
Ender's sister Valentine called him Ender because his real name, Andrew, was too affectionate and tender for the harsh environment he was facing at Battle School. By using his more formal and detached nickname, she hoped to protect him from vulnerability and emotional attachment that could hinder his success as a leader.
Because he was the third of 3 children. Peter Valentine Andrew (Ender)
she says that if he trys and fails its not his falt but if he doesnt try and the world is destroyed he is the only one to blame
In Chapter 9 of Ender's Game, Peter and Valentine collaborate on an online pseudonym called Locke and Demosthenes respectively. They use their alter egos to influence public opinion and politics through writing and online discussions. They each have their own viewpoints and goals, which they try to achieve by manipulating the online community.
Peter chose the pseudonym "Locke" and Valentine chose the pseudonym "Demosthenes" in "Ender's Game." Peter used his alias to write political essays, while Valentine used hers to write about humanitarian issues and philosophy.
The ending in the book differs from the movie adaptation, with the confrontation with the Formics being portrayed differently. The relationship between Ender and his siblings, Valentine and Peter, is more complex and nuanced, with more focus on their political influence. Certain character developments and interactions are more elaborated upon in the book, providing deeper insight into Ender's psyche and the challenges he faces.
He had an antagonistic relationship with his brother Peter and a compassionate relationship with his sister Valentine.
It is from the mispronunciation of his first name, 'Andrew', by his sister, Valentine, when they were both young.
Valentine had conflicting ideas with her older brother, especially when they start writing and her older brother tries to control what she thinks and can write.