What Do You Think?

[cmbearly]

A cousin and I have been trying to help two supposed half sibs find their bio father. The female was born in Germany to a German mother during the Korean conflict, the male was born in Booneville, MO. They have as many cMs as a lot of FULL sibs, and no father has been found to even be considered at this point. What is the possibility they have a different relationship than half siblings with the cMs being so high? They are as high as my cousin's and her full brother. As stated one mother was living in Germany,the other was in high school at the time of birth of the male. The male was born in 1949, the female in 1952. Thoughts on this -

[ltd-jean-pull]

Have they uploaded to Gedmatch?

[cmbearly]

I think the female has - not sure about the supposed half brother. Within the family tree, we have found many, many instances of intermarriages where brothers married brothers, cousins married cousins, etc. Wondering if that would make their cMs possibly higher than the actual relationship is -

[loobster]

You refer to "two supposed half sibs" - is the idea they are half-sibs based solely on the DNA match, or were they already thinking they were half sibs?
Do they each know who their mother is?
And is there any chance the mothers are related?

If they have the same father and their mothers are related, then this could definitely raise the expected shared cM above that of simply half-sibs.

[travers]

A cousin and I have been trying to help two supposed half sibs find their bio father. The female was born in Germany to a German mother during the Korean conflict, the male was born in Booneville, MO. They have as many cMs as a lot of FULL sibs, and no father has been found to even be considered at this point. What is the possibility they have a different relationship than half siblings with the cMs being so high? They are as high as my cousin's and her full brother. As stated one mother was living in Germany,the other was in high school at the time of birth of the male. The male was born in 1949, the female in 1952. Thoughts on this -

Are you the one actually doing the research on this? How much cM's do they share with one another? You have written here many times before about this but you have never included this information.

[cmbearly]

They share 2017 cMs. The female's mother was born and raised in Germany and the female was born in Germany in 1952. The male was born in Booneville, MO in 1949. The male's mother at the time of his birth was 15. They DO NOT have the same mother. All dna relates them to my father's side of the family. The male has other dna matches who he suspects are his mother's relatives. The female has none.

What we are wondering at this time if maybe we are looking for two different fathers.

BTW, they did their dna randomly through Ancestry and that is how they found each other and other family members on my father's side.

[prairielad]

Has the male done any yDNA testing, this may indicate a surname (yDNA37 or higher)

[cmbearly]

Both my helper cousin and I have encouraged him to do this -

[travers]

They share 2017 cMs. The female's mother was born and raised in Germany and the female was born in Germany in 1952. The male was born in Booneville, MO in 1949. The male's mother at the time of his birth was 15. They DO NOT have the same mother. All dna relates them to my father's side of the family. The male has other dna matches who he suspects are his mother's relatives. The female has none.

What we are wondering at this time if maybe we are looking for two different fathers.

Thanks. Your statement in your first post that they "have as many cMs as a lot of FULL sibs" is false though. Full sibs would share more than this. They share what would be expected for half sibs, based on their ages and your information that there is no connection through the mother's side they would more than likely share the same father. There are other possibilities though so it wouldn't be 100% but regardless they would be very closely related.

They are as high as my cousin's and her full brother.

Are you sure these 2 people are full sibs? If they share less than 2017 cM's it sounds doubtful.

[prairielad]

I would say if not the same father, it would be a close relationship between the fathers

Father/Son
Uncle/Nephew

Attached is what myself and siblings share with a Maternal Uncle

Attachment on onedrive

https://1drv.ms/i/s!Al27wnXopRKxhEPOU9cs81xRwkfL

[mattn]

Within the family tree, we have found many, many instances of intermarriages where brothers married brothers, cousins married cousins, etc. Wondering if that would make their cMs possibly higher than the actual relationship is -

Very doubtful that these marriages would have any effect on the relationship predicted, not at the amounts you are seeing (it would raise the amount of cM's but not to the extent of what you are asking). Most likely they share the same father. The only other real possibilities would be uncle/niece, aunt/nephew, grandparent/grandchild or double first cousins. You can throw out the grandparent/grandchild relationship of course and also from your posts you state that the mothers aren't related so that would eliminate the double first cousins. So you are only left with the possibility that they share the same father or one of these people are an aunt or uncle to the other. Based on the fact that they were born 3 years apart I would say the odds are they share the same father but it wouldn't be impossible that one is an aunt or uncle to the other.