He is my great great grandfather too. Through Leonard and his son Oscar. Unfortunately I never got to meet my grandfather Oscar due to the age gaps and my father being the youngest of 8 and he pasted when my father was in his 20's I think. I also only have one very bad photo of him and love seeing relatives photos....I like to see if there are any distinguished Holterman features!
Also trying to work out the mystery of the name "Emmett" and a certain Belinda being in an Aussie movie called "The Nugget". Often wonder if she was a great great niece of his.