— born in Iowa or Indiana:
2.  John W. ENGLEDOW, b. 1858/9

— born in Eagle Twp., Boone Co., IN:
3.  Hiram N. ENGLEDOW, b. 1860/1
4.  Charles E. ENGLEDOW, b. 1862/3
5.  Rosella A. ENGLEDOW, b. 1864/5
6.  Mary E. ENGLEDOW, b. 1865/6
7.  Perry W. ENGLEDOW, b. 1867/8
8.  Sarah E. ENGLEDOW, b. 1868/9

1.  Indiana Works Projects Administration.  1940.  Index to Marriage Records, 1844-1920, Boone County, Indiana (online at Ancestry.com):

William C Engledow

Martha St Clair

11 Jan 1855

14 Jan 1855

Boone Co., IN

Book C-3, p. 64

The later date is the marriage date, so the earlier date is presumably the license date.

2.  Benton County, Iowa, 1856 State Census: Name Index (online at the Benton County IAGenWeb site):

[3 ENGLEDOWs plus...] HUTTON Isaac A... [16 INGLEDOWs plus...] INGLEDOW William C. INGLEDOW William R.

William R. ENGLEDOW is our subject's father; Isaac A. HUTTON is married to our subject's aunt, Elizabeth ENGLEDOW.

3.  1860 Census Index/Images (online at Genealogy.com, Image #21 of 34 — indexed "Englederst"):  Zionzville [Zionsville] P.O., Eagle Twp., Boone Co., IN, Roll 245 (Book 2), p. 784, PN 156, 1160/1122, enumerated 21 Jul 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

William C Engledow	27	M		Farmer	2500	400	Indiana
Martha       "	23	F					"
George W     "	5	M					Iowa
John W       "	1	M					"

4.  1870 Census Index/Images (online at Genealogy.com, Image #38 of 59):  Zionsville P.O., Eagle Twp., Boone Co., IN, p. 85B, PN 38, 336/338, enumerated 1 Aug 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):

Engledow William C	37	M	W	Farmer	6700	900	Indiana
"    Martha	34	F	W	Keeping House			"
"    George W	14	M	W	At Home			Iowa
"    John W	12	M	W				Indiana
"    Hiram N	9	M	W				"
"    Charles E	7	M	W				"
"    Rosella A	5	F	W				"
"    Mary E	4	F	W				"
"    Perry W	2	M	W				"
"    Sarah E	1	F	W				"
"    William R	69	M	W	Farmer	1000		Tennessee
"    Mary M	67	F	W				"	Insane
"    Hutton Angus	19	M	W	Farm Laborer			Indiana

William & Mary Malinda ENGLEDOW are our subject's parents; Angus HUTTON is our subject's first cousin, son of his late aunt, Elizabeth (ENGLEDOW) HUTTON. 

5.  WorldConnect / Ancestry World Trees (online at RootsWeb.com/Ancestry.com).