I did find a Jacob Feather in 1860 living with John Brum 44 and Elizabeth 37 in Warwick Twp of Lancaster Co which is next to Lebanon Co.The biggest town nearby is Littitz.
I found PA69 family with a child William 7 in 1850 but this really would be a stretch to get Jacob out of that.
I found PA10 family with a Jacob 7 in 1850 living in Schaefferstown in Lebanon County.This is the family of Samuel 43 and Matilda 42 with Anne 12, William 10 and Jacob 7. In 1860 it is Sam 50, Matilda 50 Anne 22 and Jacob 16. This appears to be Jacob Fetter April 1842 x 1869 Mary Phillipy Dec 1840 of Schaefferstown.
I had no census records for Jacob x Mary Feather with the kids you listed.
Sorry,There are a lot of same name Feather and Fetters running around the county at that time.It can get confusing as to who is who.Jacob is one of the most popular names at the time.