I may have the individual, though not confirmed (just an educated guess):
Valentine Acker b. 27 Nov 1756 in Lunenburg, NS d. 1837 wife: Anna C. Himmelman b. 09 Jan 1761
They were married 22 Jan 1782 - the same year your John Valentine Acker was born. I do not have him in Valentine and Anna's family - but do have the first child Anna Catherina as being born in 1784 which is close. Perhaps John was the first child born?