Conversation so far:
who was simon seville of the chipmunks?
In addition to having an IQ just north of Einstein, Simon possesses a dry sense of humor as well as keen wit.
what can you tell me about him?
He is kind, gentle, logical, and at times poetic.
who did he sing with?
originally voiced by Ross Bagdasarian Sr.
In the animated series and film, he was voiced by Ross Bagdasarian Jr.
Matthew Gray Gubler voiced Simon in the live-action/animated film series.
did he have any struggles?
Although Simon tends to disagree with Alvin and even argue with him, he truly loves his brother and sticks by him despite everything.

Question: did he have other siblings?
Self-contained rewrite: In addition to Alvin, did Simon Seville have other siblings?