The book The Genealogy History & Alliances of the American House of Delano 1621 to 1899 (GHAAHD) on page 526 has Nathaniel Chase Delano married to Jane Drown, the daughter of William and Mary (Horton) Drown. GHAAHD also has on page 525, William Hale Delano married to Eliza Drown, the daughter of William and Mary (Horton) Drown.
The book does not give any birthdate for Jane Drown, however it lists Eliza as being born 10 Aug 1819 in Pennsylvania and her death date as 19 Feb 1858 in Richmond, NY.
Nathaniel and William were sons of Calvin Delano, b. 25 Dec 1786 near Boston, MA, d. Nov 1839 in Canandaigua, NY and Bethsheba Hale. Calvin's parents are not known, but he had the following siblings: Sylvanus, Hiram, Annie and Laura.
This line of Delanos is listed on pages 524-527 in GHAAHD as a "Delano Line Unknown". I could copy these four pages for you and send them via either snail mail or fax.