TAE's youngest son, William (#11) Colville Emmet married Laura Coster and had 1 daughter and 10 sons. Henry Coster (#48) was the 8th son and the only child in that huge family to have children who lived to be adults. Henry was born on Jan. 27, 1846 in New York City and raised there. Although some of his nine brothers went to Columbia, I have not been able to find out where he was educated.
He became a member of the NY Stock Exchange and a stockbroker on Wall Street, working there for over 30 years in various firms.. He married Marie Louise Case on April 27, 1886 at the Fifth Avenue Presbyterian Church when he was 40 years old; she was the daughter of Sarah Jane Strong and Watson Elijah Case and came from an old New England family which settled first in Hartford, CT in the early 1600s. The wedding reception was at her parent's house at at 471 Fifth Avenue.
The NY Times article about the wedding (April 28, 1886) says that the bride was dressed in "white satin, with a front of point lace." Her mother wore "Spanish lace and heliotrope satin, with diamond ornaments," and her sister, Jeannie Case Twombly, wore "yellow satin trimmed with point Venetian lace." The two bridesmaids "were charmingly attired in white." Henry's brother, Charles was the best man and another brother, Edward was an usher, as was Marie Louise's brother Harry.
Marie Louise and Henry had five children: Henry Coster Jr, Laura, Watson Case (named after Marie Louise's father,) Jeannie and Marie Louise - all born between 1887 and 1894. For most of their married life, they lived in a house at 39 East 72nd Street, having first been at 4 East 41st street.
Henry was one of the founders of the Riding Club in 1883, which enabled its members to ride together in Central Park, and also a member of various New York men's clubs. In addition to their house on 72nd Street they often traveled to Europe; after Henry's death on July 12th, 1923 in Hewlett, Long Island, Marie Louise went to Paris so frequently that she listed her address as c/o Morgan & Co in Paris.
Marie Louise was an active member of New York society - giving dances for her children, serving as a patroness of the Junior Cotillion and making sure her daughters went to all the "right" parties. She was back in New York in the winter of 1930, and died there on Dec. 22nd. Both Henry and Marie Louise are buried in the Woodlawn Cemetery in the Bronx.