Conversation so far:
Where was Theodore Roosevelt born?
Theodore Roosevelt Jr. was born on October 27, 1858, at 28 East 20th Street in Manhattan, New York City.
Who was Theodore Roosevelt Jr.'s mother?
Theodore Roosevelt was the second of four children born to socialite Martha Stewart Mittie Bulloch and businessman and philanthropist Theodore Roosevelt Sr.
What type of work did Theodore Roosevelt Jr.'s father do?
Theodore Roosevelt Sr. served as a member of the plate-glass importing business Roosevelt & Son.
Did Theodore Roosevelt have any siblings?
Theodore Roosevelt had an older sister, Anna (nicknamed Bamie), a younger brother, Elliott, and a younger sister, Corinne.

Question: What were his interests in his early life?
Self-contained rewrite: What were Theodore Roosevelt's interests in his early life?