1.  Letter, dated 19 Jun 1858, from Keziah (GREENLAND) SHANAFELT (click her link for a full transcription) of Clarion Co., PA, to her son, Thomas.  Keziah is a granddaughter of Benjamin & Sarah (SIAS) CORBIN.  The letter is in the possession of  Laurel Shanafelt Powell of Colorado, and Lorinda Clendenon Greenland generously posted a transcription at her web site. 

My mother's father was Benjamin Corbin; her mother Sarah Sias.  I think they both came from England.  Their ancestors lived in England where some of them still remain... Grandmother had two brothers -- Joseph and Benjamin Sias.  I remember seeing them many years ago.  They moved to Ohio.  She had a sister named Keziah Sias...

2.  1790 Census Images (online at Ancestry.com; extracted by Diana Gale Matthiesen):

1790

MD

Baltimore Co.

Patapsco Lower Hundred

p. 204

Joseph Sias

3-3-5-0-0

These data indicate:

Gender and Type	Age Class	Therefore Born	Individuals Inferred
3 free white males	16 or over	in or bef. 1774	= Joseph = Son A = Son B
3 free white males	15 or under	1774-1790	= Sons C, D, E
5 free white females	all ages	in or bef. 1790	= Wife = Daughters A, B, C, D

We can't be certain who the ten people are living with Joseph.  Most likely they are his wife and children; and, for now, I'm going to make that assumption.