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Um genetic science? If neither immediate parent of the child has brown eyes, it's highly unlikely. Light colored eyes is a recessive trait, sometimes genes can mix and that's how green eyes happen, but it can't un-seperate the genome in terms of passing the trait on. Unless the parents aren't the true parents, it would be an anomaly if the kid had brown eyes.
Grandfather or grandmother genetics doe's really apply here. My grandmother on my dad's side had blue eye's and I have blue eye's while everyone else in the family has brown eye's.
@BobbyC65 think of it like you carry two codes, you can have a dominant and a recessive, but blue means you have two recessives. So if you have someone who has BrBl the brown will overwrite, but someone with blue eyes it's BlBl. That's why two blue eyed parents will have a blue eyed baby but two brown eyed people might not have a brown eyed baby if both parents carry that recessive gene. So the baby has a 25% chance of having blue eyes.
Brown will always be dominate color genetics wise