1.  Marriage Record:

2.  1840 Census Index/Images (online at Ancestry.com; Image #7 of 14; extracted by Diana Gale Matthiesen):

1840

PA

Union [now Snyder] Co.

Perry Twp.

p. 389

Ln. 11

Mitterling Baltzer

120 010 - 001 010

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	4 or under	1835-1840	= William (b. 1837/8)
2 males	5-9	1830-1835	= Jacob (b. 1834/5) = Peter (b. 1832/3) = John (b. 1830/1)
1 male	20-29	1810-1820	= Baltzer (b. 1806/7)
1 female	10-14	1825-1830	= ?
1 female	20-29	1810-1820	= Elizabeth (b. 1819/20)

3.  1850 Census Index/Images (online at Ancestry.com; Image #9 of 33):  Perry Twp., Union [now Snyder] Co., PA, p. 102A, 60/60, enumerated 14 Nov 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

Balthazer Mitterling	43	M		Farmer		Penna
Elizabeth Mitterling	30	F				"
John Mitterling	19	M				"
Peter Mitterling	17	M				"
Jacob Mitterling	15	M				"
William Mitterling	12	M				"
Samuel Mitterling	10	M				"
Benjamin Mitterling	8	M				"
Solaman Mitterling	6	M				"
Susanah Mitterling	4/12	M				"

Either Elizabeth is lying about her age or Balthazar had an earlier wife.  Living next door to Peter MITTERLING (æ 42, b. PA, wife Annamaria), who is three households from Elizabeth's brother, John HAAS, who is next door to Elizabeth's father, Valentine HAAS.