Searching Sunday posts will be dedicated to blogging about tracking the Vanderbilts through census records.
Sophia Vanderbilt Cross Morse (1839-1903) was the granddaughter of the Commodore’s via his daughter, Phebe Jane Vanderbilt and husband James Madison Cross. In 1864 she married Jerome Bonaparte Morse. In 1870, I find Sophia sans Jerome. Perhaps he was away? He is not dead in 1870 since their youngest child, Ethelinda, would be born in 1872. I wonder where he is?
In any case, here are Sophia and children Grace (age 4) & Howard (age 3) in 1870. They are enumerated in Saybrook, Middlesex County, Connecticut, the town where Hartford native, Katherine Hepburn, died in 2003.
They live with a family whom I’m not yet sure of the connection.

Source: Year: 1870; Census Place: Saybrook, Middlesex, Connecticut; Roll: M593_108; Page: 369; Image: 300.