— born in Henderson Twp., Huntingdon Co., PA:
  3.  Joseph R. GRADY, b. 1822
  4.  John D. GRADY, b. 10 May 1825; m. Sarah WRAY
  5.  (Daughter A) GRADY, b. 1825-30
  6.  Lucinda GRADY, b. 1827/8 
  7.  Lucy/Lacy [Elizabeth?] GRADY, b. 1830 
  8.  Zelean / Zala Ann / Zariah / Julia Ann / Ann GRADY, b. 29 May 1833 
  9.  Thomas Davis GRADY, b. 17 Mar 1837; m. Maria MILBOURN; lived Wayne Co., OH
10.  Martha E. GRADY, b. 1839/40; m. Peter "Pete" SCUDDERS

1.  Marriage Record:  said to be married in Lancaster Co., PA, which seems doubtful given that Hiram's parents were in Huntingdon County by 1810.

2.  1820 Census Index/Images (online at Ancestry.com; Image #3 of 6; extracted by Diana Gale Matthiesen):

1820

PA

Huntingdon Co.

Henderson Twp.

p. 68

Ln. 16

Hiram Grady

100010-10100-0-000

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	9 or under	1810-1820	= William
1 male	26-44	1775-1794	= Hiram (b. 1792)
1 female	9 or under	1810-1820	= Mary Jane (b. 1820)
1 female	16-25	1794-1804	= Elizabeth (b. 1796/7)

Listed next to Hiram's father, William GRADY (Ln 17, 000001-00200-0-000).  William was in the 1810 census of Huntingdon Twp., Huntingdon Co., PA, so we can presume that Hiram was living there, too, with his parents, which makes me wonder if Hiram was actually married in Lancaster Co., PA.

3.  1830 Census Index/Images (online at Ancestry.com; Image #9 of 14; extracted by Diana Gale Matthiesen):

1830

PA

Huntingdon Co.

Henderson Twp.

p. 135

Ln. 23

Hiram Grady

201 001 - 201 011

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
2 males	4 or under	1825-1830
0 males	5-9	1820-25	= John (b. 1825) = Joseph (b. 1822)
1 male	10-14	1815-1820	= William
1 male	30-39	1790-1800	= Hiram (b. 1792)
2 female	4 or under	1825-1830	= Lucinda (b. 1827/8) = Daughter A
1 female	10-14	1815-1820	= Mary Jane (b. 1820)
1 female	20-29	1800-1810	= ?
1 female	30-39	1790-1800	= Elizabeth (b. 1796/7)

John and Joseph should have been in the 5-9 age class.  Note that it would have been unusual for them to have had four children in five years (two daughters and two sons), especially if they had had zero children the previous five years.  The female in her 20s is too old to be their daughter.  Listed next to Robert WRAY.

4.  1840 Census Index/Images (online at Ancestry.com; Image #5-6 of 20; extracted by Diana Gale Matthiesen):

1840

PA

Huntingdon Co.

Henderson Twp.

pp. 205B-206A

Ln. 7

Hiram Grady

100 210 100 - 121 100 100

0400000

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	4 or under	1835-1840	= Thomas (b. 1837)
2 males	15-19	1820-1825	= John (b. 1825) = Joseph (b. 1822)
1 male	20-29	1810-1820	= William (b. 1816-20)
1 male	40-49	1790-1800	= Hiram (b. 1792)
1 female	4 or under	1835-1840	= Martha (b. 1839/40)
2 females	5-9	1830-1835	= Zalean / Zala Ann (b. 1832/3) = Lucy (b. 1830)
1 female	10-14	1825-1830	= Lucinda (b. 1827/8)
1 female	15-19	1820-1825	= Daughter B? (b. 1825?) = Daughter A? (b. 1820?)
1 female	40-49	1790-1800	= Elizabeth (b. 1796/7)
4	persons employed in agriculture

5.  1850 Census Index/Images (online at Ancestry.com; Image #11 of 21):  Henderson Twp., Henderson Co., PA, p. 66A, 84/84, enumerated 28 Aug 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

Hiram Grady	57	M		Farmer		Penna
Elizabeth "	53	F				"
Lucy      "	20	F				"
Zalean    "	17	F				"
Thos      "	14	M				"
Martha    "	10	F				"
Sarah Grudy (sic)	50	F				"	Idiot
Wm Cornelius	6	M				"

Sarah is probably Hiram's sister.

6.  1860 Census Images (online at Genealogy.com; Image #9 of 15):  Huntingdon P.O., Henderson Twp., Huntingdon Co., PA, Roll 1115 (Book 1), p. 261, PN 9, 63/60, enumerated 8 Jun 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

Hiram Grady	68	M		Farmer	3000	1200	Penna
Elizbeth "	64	F					Do
Thomas   "	23	M					Do
Martha E "	20	F					Do

Listed next to widowed daughter, Lucinda (GRADY) CROWNOVER. 

7.  Archives of the GRADY-L mailing list (online at RootsWeb.com).

8.  LDS.  Family Search: Internet Genealogy Service:  IGI - International Genealogical Index (online at FamilySearch.org).

9.  Emails from Rosemary Crownover.