Veronica is Silvia's eldest sister, and in many ways her greatest nemesis. Silvia was terrified of Veronica for most of her life because of Veronica's harsh training methods, though she seemed to respect her greatly.
Silvia is always embarrassed and irritated by her father's insane hijinks.
Silvia seemed to at one time idolize her big brother, and even after she believed him to have committed the act of dragonslaying, she cared for him deeply.
She was attracted to him for a while during the series because of his personality and traits that he posesses, and the things he accomplished during the time with her. Silvia finds out the truth about Ash during Volume 5 that he was the boy that saved her, and gave her that Dragon and she has cherished memories of this boy, and loves this boy dearly.
Silvia rushes into the Forest to find Ash, and confesses to him about that he is the boy that saved her in the Forest during that time, and that she loves him dearly, and she kisses him passionately and swears to Echo that Ash will be her lover, and nothing will stand in her way even if she is the Princess of the Dragons.
The relationship has now become intimate because the kiss that was given to Ash was of an intimate adult variety, and Echo was furious in seeing this happen, and tried to get Silvia off of Ash because it was becoming too hot of a scene to handle.
This event happened in Volume 5, and it has changed the relationships between Echo and Silvia forever they are friends but they are fierce rivals because Silvia desires him as much as Echo, and a bitter love war has started that will not cool off because Silvia said that she will not back down on this ever.
She is a close friend but now they are bitter rivals for the affections of Ash because she will not give up on Ash after she found out the truth, and she said that she will fight with Echo with everything she has to take him, and she will not back down in this manner because this happened on Volume 5, and Echo will have to fight with everything she has to keep her away because Silvia is as serious as Echo with Ash right now.