John (1800) Daniel (1811) Jacob (1816) Georg Philip (1820) Isaac (1821) - twin Abraham Sylvester (1822) - twin
They are all accounted for nicely in the census. No one is missing and there are no unexpected males. Their leaving home after marriage and the birth of the first child all seems to work out. The twins were apparently born just before and after midnight.
Some sources name Noah (1828), but there is no place for him in Daniel & Mary's census. There is an unexplained male of his age in the 1830 & 1840 census for John, their oldest son. I am guessing Noah belongs to John, but your guess is as good as mine.
There is a George (1802-1839) buried in Northumberland Co. No clue who he might be.
Isaac's obit mentions a family of 12 children. Let's say six sons for Daniel & Mary. The six remaining daughters are a problem. We know of Catherine, who m. Abraham Long from Daniel's will. The interweb has her b.1828 and Abraham, b.1811. I have no idea why they think she is a Wertman.
It seems the correct Catherine Long is found in 1850 & 1860 Lewis Twp with, Abraham (1785) and 1870 Lewis Twp with son, Zacharias. Her age varies from 1793 to 1798. I have not found them pre 1850 and have no idea what either of them were doing before they married in about 1823.
The census suggests seven daughters:
Catherine (1793 or 1798) Five (1800-1810) One (1810-15)
I would say one passed young and was not included in the 12. There is an extra young female (1825-1830) in 1840 that I cannot identify. She does not belong to John (the only male married at the time). I am guessing he is Daniel & Mary's granddaughter by one of the married daughters.
Not as definitive as you might like, but the best I can do.
For what it is worth, I have never found Daniel's wife, Mary (Anna Maria Brobst) referred to as Elisabeth, or Betsy.