Your cousins son is also your cousin (although one degree removed) and so the bride to whom you are now unrelated will become the mother of your (new) cousin.
What are the consequences of marrying your cousin?
They say there is no biological reason to discourage cousins from marrying. First cousins are somewhat more likely than unrelated parents to have a child with a serious birth defect, mental retardation or genetic disease, but their increased risk is nowhere near as large as most people think, the scientists said.
Is it legal for first cousins to marry?
While it may be presumed that an ancestor or descendant of the person would include a first cousin, it does not. So, while it is illegal (for good reason) to marry your parents or your grandparents, you are legally able to marry your first cousin.
How much DNA do we share with your first cousins?
In the 23andMe DNA Relatives feature, we estimate the genealogical relationship between two individuals .Percent DNA Shared by Relationship.RelationshipAverage % DNA SharedRange1st Cousin12.5%7.31% - 13.8%1st Cousin once removed6.25%3.3% - 8.51%9 more rows