Is she my sister or not?

My understanding is that two brown-eyed parents can have a blue-eyed child, but not the other way round. I wouldn´t dwell on this too much if I were you. If your sister is OK with it, then let sleeping dogs lie. My sister-in-law got badly told off when she mentioned the fact to a blue-eyed couple with a brown-eyed child.

My view is that if she has grown up in your family and you love her then she is your sister. I wouldn't try to delve too deeply and risk opening a can of worms. That could end so badly for everyone.

my daughter has a brown eyed and blue eyed and a green eyed child.She has hazel eyes and her husband has grey eyes ,the brown eyed child has a different skin tone an dtans very easily but apart from that she's her fathers image .

I would let things be. I believe the eye colour thing is far more complicated than we think. Throwback genes can emerge after several generations giving unexpected skin and eye colour. Why cause unnecessary grief?

I have one olive skinned brown eyed son, one green eyed medium skinned daughter, one very blonde very light blue eyed easily burnt son. All to the same man. The boys look nothing like each other but put my daughter in the middle and you can see the similarities. We’re a great mixture of genes. I think it’s amazing what our gene pool throws up and seeing it in my grandchildren is a joy. So your sister is your sister no matter how different she looks.

Yes it is possible.

And it is possible, but rare, for two blue eyed parents to have a brown eyed child.

polyester if each blue-eyed parent carries the dominant brown-eyed gene then it can produce a brown eyed child.

both my parents had brown eyes, I have green and my sister has brown, so anything is possible

My parents, brown eyed father, blue eyed mother, had one blue eyed daughter - me - one brown eyed daughter and finally a grey eyed one. Celtic and Anglo-Saxon genes well represented!

Yes, anything is possible. Among my GGC of which there are 7 from the same father, there is a flaxen-haired blue-eyed female and also in the mix is a boy who looks European ! Tanned skin and green eyes. Both parents are fair-skinned and fair-haired. Others range from light brown hair and one is a sandy blonde with curls ( both parents have straight hair )

The flaxen haired girl is a twin and looks nothing like her brother.

I went to school with twins who didn't even look like the same nationality/race! The boy was a big blonde, fair skinned lad, looked scandinavian, and his twin sister was petite, dark, with straight black hair and looked mixed race Asian. Nobody believed they were siblings let alone twins. I have a blue eyed fair skinned daughter with straight mid brown hair and a brown eyed, dark son with curly hair, but you can see the likeness in the shape of their features. I have blue eyes, DH brown/hazel.

I've got hazel eyes, my husband has got blue. We've got a son with blue eyes, a son with brown.

My Dad had brown eys, Mum had blue. 2 of my brothers had bworn eyes, 1 had blue, and, as I say, mine are hazel.

In answer to your question, Yes, there can be a few variations in the family, all with the same parents.

So many variations possible Celeste21 As others have said, leave this one alone there is nothing to be gained by pursuing it but maybe a lot to lose. I'm not sure why you are so concerned about this.

My DH has hazel eyes and mine are blue - both our children have really brown eyes. I can assure you they both belong to both of us.

Non identical twins are no more alike than any other siblings. My twin brothers were totally different in every way but I looked very like one of them.
People are mostly mongrels, as different as a litter of mixed-breed puppies.

Yes I know watermeadow but this particular set of twins looked very different!

Eye colour like hair colour can be a real throwback. DGD has dark brown eyes like her mother. DGS has deep grey eyes like his aunt and great grandmother. I have Hazel eyes the product of ablue and grey eyed parent -

Now here is a warning story for the OP and others. During Apartheid in South Africa a dark skinned and dark eyed child was born to a white family. It was shown that she was the child of both known parents. No question of any other parent. It was found that some way back in the ancestry of one or both parents there had been a cross race marriage that several generations later produced this child.

I believe that she was taken away from her true parents and fostered/adopted into what the authorities thought was a more appropriate racial group.

So OP, stop indulging in these fantasies. The genes that produced your sister may be a throwback to the genes of grandparents or their parents, on either side of the family.

Perhaps you are the odd one out, despite looking like everybody else.

My Dad was fair-haired and skinned with blue eyes; Mum had pale freckly skin, but brown eyes and brown hair. All 3 of us offspring have very dark skin (think mediterranean), brown eyes and dark brown hair.

When my brother was born my grandmother (mum's MIL) took one look at him and said "He is not one of ours!" - so that went down well with Mum! - they never got in after that.

However my Mum's Mum was dark-skinned with flat nose and curly black hair. So that is where it comes from - I would love to do our DNA and find out where it all comes from.

We're all Heinz 57's whether you like it or not.

I think modern genetics would state that the parents you mention could well have children with totally differing eye and hair colour.

It is being said that genetic traits can be inherited from our great-great grandparents. Whether this is true or not, I cannot say, not being a geneticist.

I read an article about this REALLY recently. The older schools of genetics always thought that 2 blue eyed parents couldn't have a brown eyed baby. They called this the recessive gene.

HOWEVER, they have recently discovered that this isn't true and that parents can have children with any eye colour. Your family's situation in fact. I'll have a look for the article. But can't remember where I read it so...

My Dad had black hair and brown eyes. My Mum had light ginger hair and grey/blue eyes. My younger sister and I had brown hair and hazel eyes, my middle sister had striking red/Auburn hair and dark brown eyes. Genetics is fascinating, but complex. A DNA test would be the only way to find out your family connections for sure.

Does it matter Celeste?

If she acts like your sister, if she feels like your sister , if YOU love her like a sister then she’s your sister.

Everything else is irrelevant .