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Sunny often does not give Silvia much of a break, especially since his eldest brother had to move out for college. He sometimes takes her for granted and likes to annoy the hell out of her, but he recognises when enough is enough (usually) and cares for her and her well-being.
Silvia usually helps Sunny with his homework, but she does not appreciate being pestered and teased by him. As much as she finds him annoying most of the time, she finds him also endearing in a way, and finds the house too quiet without him around.
Willow absolutely adores his sister and actually doesn't mind that he babies her quite a lot. He loves hugging her and calling her adorable, finding it a bit hard to admit that she has grown up already (somewhat).
Silvia has no qualms with using her brother's adoration of her, though she doesn't like it when he treats her like a "little" sister even though she's not so little anymore. Nonetheless, she usually keeps these mumblings to herself, deep down liking the attention and love.