Family tree interpretations

[Eustace_Scrubb]

I was hoping that finally having a version of the Black Family tree my
eyes could actually read, all would become clear.
(http://www.hp-lexicon.org/wizards/blackfamilytree.html)

Alas...I am guessing that whoever reported the dates on the center
section may have misread a few of them.

To wit, Pollux Black (born 1912) is listed as having fathered Walburga
(b. 1925) when he was 13.  Likewise, his son Cygnus (b. 1938)
apparently fathered Bellatrix in 1951, when _he_ was 13.

I realize that we have evidence of early marriages and child-bearing
in the WW, but I think this is pushing it!  Either JKR is even worse
in maths than we already suspected or some of these birthdates have
been misread from the original.  Of course, if you push back Pollux'
birth year too much, then _his_ father starts to stray into the
teen-dad area.

I guess I'd conclude that the dates on this adaptation of the family
tree still need to be taken with large grains of salt and that it may
not be safe to build extensive theory on them until further
clarification (should we be lucky enough to get such).

Cheers,

Eustace_Scrubb