Would this be their second cousin once removed?

So, this is confusing, but I need an answer: So, a kid's great-grandfather had a wife who gave birth to a different kid. The grandfather divorced her, got another wife, and had the great-grand kid's father. Then the kid from the different wife has a kid. What would be the relationship be called between... show more So, this is confusing, but I need an answer:

So, a kid's great-grandfather had a wife who gave birth to a different kid. The grandfather divorced her, got another wife, and had the great-grand kid's father. Then the kid from the different wife has a kid.

What would be the relationship be called between the great-grand kid and the kid from the other wife's son?
Update: To try and make this less confusing for you all:
A guy has a wife. They have a kid we'll call Jeff. They get divorced. The guy gets another wife and has a kid we'll call Nick. Nick has a kid named Bob. Jeff has a kid named Tom.
What is the relationship between Bob and Tom called?
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