I have Yuengert's in Pennsylvania starting with George born 1835 in Germany, died 1880 in Pittsburgh, PA.
Your James was living with his brother Louis C. in Butler, Butler County, PA during the 1910 census. He was 18 at the time and Louis was 23 living with his wife Gertrude and their son John.
I do not a specific connection with you yet but feel sure if we work together, it will occur.
I have a picture of George's daughter Mary born 1868. I do not have information on his son William or George. Your line may come from one of those sons.