Relationships
Of which there have been many, some more successful than others, none enduring, but here we talk to those concerning family.

At 04:10 GMT (this may be corrected, it was 4 something) today I became a great or grand, uncle. Lucy, my niece, gave birth to a, as yet, unnamed girl-child.

Mother and daughter fairing well.

My sister, Christine, called me about an hour later. For me it was still June 26th. This also brings into focus the relationship of time and geographical location.

Of the three siblings, David, Christine and myself (first listed, last out so to speak) only Christine has been a producer. Two females, Katy and Lucy. Our Mother is grandchild poor.

Now another child into the fold.

The father, lest we forget, is Andy. A young man I have not met but by all accounts a worthy consort for Loverly Lucy.

Should the child prove photo-worthy, I shall post a pic or two.

Mathematical Definitions
(Excerpted From Wikipedia, the free encyclopedia)

The family relationship between two individuals a and b, where Ga and Gb respectively are the number of generations between each individual and their nearest common ancestor, can be calculated by the following:

x = min (Ga,Gb)
y = |Ga-Gb|
If x=0 and y=0 then they are the same person.
If x=0 and y=1 then they are parent and child.
If x=0 and y=2 then they are grandparent and grandchild.
If x=0 and y>2 then they are great ... great-grandparent and great ... great-grandchild, with y−2 greats.
If x=1 and y=0 then they are siblings (brothers or sisters).
If x=1 and y=1 then they are uncle/aunt and nephew/niece.
If x=1 and y>1 then they are great ... great uncle/aunt and great ... great nephew/niece, with y−1 greats.
If x>1 and y=0 then they are (x−1)th cousins.
If x>1 and y>0 then they are (x−1)th cousins y times removed.
So two people sharing a pair of grandparents have x=2 and y=0 and are described as being first cousins.

If x>0 and they only share one nearest common ancestor rather than two, then the word "half" is sometimes added at the beginning of the relationship.

The mathematical definition is more elegant if you always express consanguinity as the ordered pair of natural numbers (x, y) as defined above. In that case, the relationship one has with oneself is (0, 0), the relationship between parent and child is (0, 1), and the relationship between grandparent and grandchild is (0, 2). The relationship between siblings is (1, 0); and between aunt/uncle and nephew/niece is (1, 1). First cousins are (2, 0). The first number expresses how many generations back the two people's most recent common ancestor is, while the second number expresses the generation difference between the two people.

See Also....

Consanguinity

Genealogy

Genetics

Marriage

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Medicine stubs

Sociology stubs