1.  Marriage Record:

2.  1850 Census Index/Images (online at Ancestry.com; Image #6 of 44):  Carroll Twp., Chautauqua Co., NY, p. 83B, 43/46, enumerated 14 Sep 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

Levant B? Brown	27	M		Merchant		NY
Florinda	24	F				"
Sela Havens	65	M		Merchant		"

3.  1860 Census Images (online at Ancestry.com; Image #11 of 79):  Jamestown P.O., Jamestown, Chautauqua Co., NY, p. 664, PN 110, 817/817, enumerated 23 Jul 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

Samuel A. Brown	65	M		Secial? Seregate?	6000	3000	Connecticut
Prudence O  "	62	F		Housekeeper			N.Y.
C. Octer?   "	15	M		Student			"
Careline Lawson	19	F		Servant			Sweden
Levant B Brown	36	M		Law Student	4500	1000	N.Y.
Flarinda M "	33	F		Housekeeper			"
Electa B   "	3	F					"
Robert F Hazzard	26	M		Grocier	2500	4000	N.Y.
Mary        "	20	F		Domestic			"
Jason       "	56	M		Clerk in Grocery	3000	200	"

Samuel & Prudence are Levant's parents.

4.  1870

5.  1880 Census Images (online at Ancestry.com; Image #5 of 68):  Jamestown, Chautauqua Co., NY, p. 325A, PN 5, SD 11, ED 55, enumerated 2 Jun 1880, official enumeration date 1 Jun 1880 (extracted by Diana Gale Matthiesen):

1880:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
1	2	3	4	5	6	8	9	11	13	24	25	26
32	34	Brown, Mrs L.B.	W	F	53			/	Keeping house	New York	New York	New York
		_____, Ely	W	M	25	adopted son	/		Jeweler	on the ocean	Sweden	Sweden
		_____, Electa B.	W	F	23	daughter	/		At Home	New York	New York	N.Y.

6.  William S. Pelletreau.  1907.  "BROWN."  Pp. 15-19 in Historic Homes and Institutions and Genealogical and Family History of New York.  Lewis Publ. Co., New York (reprinted 1998 by Genealogical Publ. Co., Baltimore, MD; online at GenealogyLibrary.com).  Eight generations of a line of BROWNs featuring Levant's father, Samuel A. BROWN.