There are three Haldeman family lines found in Lancaster Co., PA during the early 1700's.This is based on the work of the Rev. Carl Thurman Smith and is corroborated by the work of Richard W. Davis.
1. Jacob Haldeman m. Maria Miller
2. Christian Haldeman m. Anna Neukommt
3. Christian Haldeman m. Christiana Kneissley
1 & 2 are thought to be brothers and are possibly the sons of Peter Haldeman, son of Hans Haldiman m. Anna Stutzman, son of Christian Haldeman m. Barbara Wyss. (Davis' Haldeman Family "B")
3 is thought to be the son of Michael Haldiman m. Madlena Gerber, son of Hans Haldiman m. Catharine Kuntzi.(Davis' Haldeman Family "A")
Each of the above couples had sons named Jacob.
The Rev. Smith documents #3's son, Jacob Haldeman, as marrying Maria Catarina Boin.And says "His wife and three daughters were killed by the Indians Aug. 1758 in Virginia." And further that their sons were:(1) Christopher Haldeman (Halterman), living in 1803.(2) Jacob Haldeman (Halterman), d. 1814 Shenandoah Co., Va., m. Elizabeth ______, d. 1816. and (3) Gabriel Haldeman (Halterman), d. about 1759/60 in Indian captivity.
Davis also indicates that it is #3's son, Jacob, who "probably" married Maria Catrina Boin and that she was killed by Indians.He lists their children as: (#1511) Veronica (not killed, m. Jacob Shinaver in 1759) (#1512) Jacob (m. Elizabeth) (#1513) Veronica (m. Nicholas Hoffer in 1767 - same person as #1511, 2nd marriage??) (#1514) George Daniel (died in infancy) (#1515) Christian/Christopher (returned by Indians, continues to live in VA) (#1516) Gabriel (died in captivity) (#1517) Daughter (killed by Indians) (#1518) Daughter (killed by Indians) (#1519) Charles ? (#1510) Daughter (killed by Indians)
(I suspect, #1519, Charles Halterman is not in this line, but is the Charles Halterman who was a Hessian soldier who was captured during the Rev. War, escaped and continued to live in VA.)
Your records indicate: Baptisms: Jacob Johannes George Daniel
Poh Will (1767): Jacob Christian Adam
So, if we concentrate on the boys: Christian/Christopher - appears in will in 1767, continues to live in VA Jacob - baptized, appears in will in 1767, continues to live in VA Gabriel - died in captivity in 1759, possibly "Johannes" who was baptized in 1745 George Daniel - died in infancy Johannes - baptized, but not in will, so may have died, could possibly have been "Johannes Gabriel" Adam - appears in will, but nowhere else, could be "Johannes Adam" and could be the baptized child
So, to attempt to answer your questions: 1.All the existing documentation points to Jacob Haldeman m. Maria Catarina Boin as being the son of Christian Haldeman & Christiana Kneissley.The "Jacob" sons of the other two Lancaster Haldemans are pretty well documented. 2.It sounds like they had four daughters, Veronica, who survived the Indian attack and returned to PA with her father, and three unnamed daughters who were killed in the attack.It sounds like they may have had five sons as documented above.I don't know of any other baptism records. 3.I don't see much info on where Jacob and Caterina lived in Lancaster Co. - East Cocalico Township (the church location) is all I've seen on that. 4.I have not personally looked into any of this but the Smith and Davis research indicates that the family was killed by Indians.Jacob, Sr. returned to VA, perhaps with daughter Veronica (Davis research), and leaving sons Jacob, Jr. and Christian/Christopher in VA.