When a child has the same name as the father he is a Jr. When the father passes away the child drops the Jr at the end because he is no longer Jr.
Senior & Junior are used for direct relation, like father and son. I & II are used in indrect relation as when a boy (II) is named after his grandfather(I). When the boy (II) has a son and passes on the same name, that son becomes (III).
When yu have the same name as your father, you are a Junior (Jr.) When you have the same name as another member of the family that is NOT your father, (you and grandfather have same name) you would become a second (II)
There is no legal ruling on this, but the following format is the one that is most commonly used. In all cases, the names must match exactly (that means first, middle, and last). If a son has the same name as his father, that son is a Jr. If a son has the same name as his grandfather or uncle, that son is a II. If a son's father is a Jr. or a II, he is a III. Sometimes II is used instead of Jr., but that is not common (and to some interpretations not correct).
1963
This is not the way these naming conventions are used. That would never be a John Doe Jr II. John Doe is the first person in a family to have that exact name. John Doe III is the third person in the family to have that name. John Doe, Jr., is the son John Doe; he may NOT choose to be Sr even after the older John Doe has died. Depending on the history of the family, the person being called John Doe, Jr, could be the fifth person (or some other number) in the family to be named "John Doe," and therefore could also be called John Doe V. If that were the case, John Doe, Sr., could also be called John Doe IV. But you NEVER mix the Jr/Sr/II/III naming with numbering at the same time. II is ALWAYS when naming after a relative like an uncle or grandfather and a Jr NEVER becomes a II nor does he ever become a Sr.
Richard Harrison II's birth name is Richard Harrison Jr.
Jermaine Jackson II's birth name is Jermaine LaJaune Jackson Jr..
Old was Roger Bryant jr when he passed away, and when did he die?
Gurmuhk Jr. II It's a beautiful name. ~ I'd have to say Macphelio. What is more beautiful than the name Macphelio? Nothing. By the way, there can't be a Jr. II. It would have to be Gurmuhk III.
Gregg Hayden Bilson II's birth name is Gregg H. Bilson Jr..
It means The Second for example Random Guy II is Random Guy The Second. It is another name for Jr. For example Random Guy Jr. can be Random Guy II AA: Sometimes it is used if you have the same name as your grandfather. It distinguishes you from your grandfather. (There is a Davy Crocket VII)