Conversation so far:
Where did Theodore Roosevelt grow up?
Theodore Roosevelt grew up in New York City.
Did Theodore Roosevelt have siblings?
Theodore Roosevelt had an older sister, Anna, a younger brother, Elliott, and a younger sister, Corinne.
Are there any other interesting aspects about Theodore Roosevelt's early life besides growing up in New York City and having siblings?
A 6-year-old Theodore Roosevelt witnessed the funeral procession of Abraham Lincoln from his grandfather's mansion in Union Square, New York City where he was photographed along with Elliot.
Did Theodore Roosevelt marry?
On his 22nd birthday in 1880, Theodore Roosevelt married socialite Alice Hathaway Lee.
Did Theodore Roosevelt have kids?
Theodore Roosevelt's daughter, Alice Lee Roosevelt, was born on February 12, 1884.
Did Theodore Roosevelt's father approve of Roosevelt Jr.'s studies?
When Theodore Roosevelt entered Harvard College on September 27, 1876, his father advised: Take care of your morals first, your health next, and finally your studies.“
In which ways did Theodore Roosevelt's father approve of his studies?
Theodore Roosevelt's father valued moral values and personal health greater than his studies.

Question: Who was his father?
Self-contained rewrite: Who was Theodore Roosevelt's father?