1.  Marriage Index:  Maryland, 1655-1850.  Liahona Research, Orem, UT (Broderbund CD-224):

Sier, Benjamin

Entrem, Sarah

17 Mar 1814

Baltimore Co.

2.  1820 Census Index and Digital Images (online at Ancestry.com; Image #9 of 12; extracted by Diana Gale Matthiesen):

1820

MD

Frederick Co.

Ninth District

p. 76

Benjamin Sires

200010-20010-0-100

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
2 males	9 or under	1810-1820	= Son A = Abraham (b. 1816/7)
1 male	26-44	1775-1794	= Benjamin (b. 1780)
2 females	9 or under	1810-1820	= Daughter B = Daughter A
1 female	26-44	1775-1794	= Sarah
1	person engaged in agriculture

3.  1830 Census Index and Digital Images (online at Ancestry.com; Image #13-14 of 42; extracted by Diana Gale Matthiesen):

1830

MD

Frederick Co.

District No. 9

pp. 23B-24A

Benjamin Syers

000 100 100 - 002 100 100

no slaves

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	15-19	1810-1815	= Abraham (b. 1816/7)
1 male	40-49	1780-1790	= Benjamin (b. 1780)
2 females	10-14	1815-1820	= Daughter B
1 female	15-19	1810-1815	= Daughter A
1 female	40-49	1780-1790	= Sarah

4.  1840 Census Index and Digital Images (online at Ancestry.com):  not found, and I checked every page of New Market (Dist. 9).

5.  1850 Census Index/Images (online at Ancestry.com; Image #29 of 81):  District of New Market, Frederick Co., MD, p. 252A/499/503, 224/231, enumerated 3 Aug 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

Sarah Cain	66	F			300	Md
Lydia A "	38	F				Md
Benjamin Syas/Syers	70	M		Carpenter		Md

Sarah (DAVIS) CAIN is the mother-in-law of Benjamin's son, Abraham SYAS/SYERS, who is living next door.