Conversation so far:
What are Antecedents for Lewis Carroll?
Dodgson's family was predominantly northern English, with some Irish connections. Conservative and High Church Anglican, most of Dodgson's ancestors were British Army officers or Church of England clergymen.
How many siblings did Lewis Carroll have?
the third child. Eight more were to follow
How many brothers did Lewis Carroll have?
four boys. young Charles Dodgson the oldest boy
Did any of Lewis Carroll's siblings have health issues?
all of them survived into adulthood.

Question: Is there anything interesting to note about his siblings?
Self-contained rewrite: Is there anything interesting to note about Lewis Carroll's siblings?