What birth years do you have for these individuals as well as marriage year?
Can you say the location of births and the marriage, such as country, county and or city?
The first son named after his father can be called Jr. or II. After that the son of Jr becomes the third.
My grandfather had the same name as his father, so he was the second. I own his shaving mug which calls him Jr. My father was the third also known as Jr. I was the next Jr.