I stumbled upon your posting here somewhat by accident in that I was hoping to find some genealogical information for a younger man with this same name who was born circa 1904 and whom I'll now suppose to have been a son of the man in which you have an interest. This younger John Yatman Lambert was married, I think, to a woman distantly related to me, Jane Halliday Russel Lambert Wyatt (1920-2006) who may have lived at her death in Yorba Linda, CA. To my limited knowledge she had no children by Mr. Lambert but did have at least three children by her 2nd husband. Please tell me more about this whole family to the extent that you can.
Jim Gordon