i asked this question an hour ago and i don't think it was very clear, i switched it up a little so it's

Question

Say you have 2 sets of siblings that come from 2 different bloodlines: 2 brothers for the 1st set(have bloodline A) and 2 sisters for the second set(have bloodline B). In the first set the brothers' names are Max and Kent , in the second set the sisters' names are Sue and Maggie. Each set are full brothers and sisters and have the same bloodlines for each family(family A and family B).
Max marries Maggie and Sue marries Kent. They each have kids.
Because the kids don't have any differentces in there blood mixing(A+B) and have the same family on each side--unlike the usual set of cousins, which would normaly share one side but not the other--does that mean that they are very close to siblings? would it be closer to siblings if both sets of parrents were identical twins?

Answer 1

I knew someone who this actually happened to.
Each of them had a child and each child look like the cousin, it was amazing. Twins marry twins children are twins one set had dark hair and eyes other blond light eyes. go figure

Answer 2

They would be closer to actual siblings because they have the exact same ancestors. Typically with cousins, they have one branch of their family tree in common, the maternal or paternal side. In this case, both are maternal and paternal are traced back to the same lines. Odds are very good that they would have a lot in common (medical history, hair color, bodily features, etc.)

I would do everything I could to keep these kids from becoming attracted to each other. They would be guaranteed to have web-footed kids with that much cross breeding! (I stole the line from Red Forman!)

I used to work with someone close to that situation. She was married and had two children. Upon divorce, she married her ex's brother. The story deviates because she had no more children, but it could be pretty much the same story; would her second set of children be more closely related than the typical half-brother/sister relationship?

Who knows; have fun with this one!

Answer 3

I know a set of twins sisters who married brothers (not twins). Their children are cousins. They share the same exact gene pool. Genetically the cousins are the same as siblings.