Sibling similarities (esp twins)

I read the following in my sisters child psychology book, was going to just post it in the twins thread but thought others would be interested. It shows the correlation of IQ between 'related' children/people:

Relationship          Correlation (1= exactly the same)
Monozygotic Twins (identical)           
       - reared together           0.86
       - reared apart                 0.79 (very interesting)
Dizygotic Twins (fraternal)
       - reared together           0.60
Siblings
       - reared together           0.47
       - reared apart                 0.24
Parent/Child                          0.40
Foster Parent/ Child            0.31
Cousins                                 0.15

I find this sort of stuff really interesting. I especially find that no matter how I bring up my boys they're going to be very similar - but that doesn't stop me experimenting in their upbringing ... he he - I think DH may have something against that though!. Also interesting that frat twins are so close as they are often considered the same as siblings (yet born at the same time).

Edited to make sense



Edited by Twinboys2b

People always comment that I must see the girls different personalities coming out now but really they are so similar in every way. Hazel is slightly more cuddly and Esme is slightly more adventurous but mostly they are very alike in personality as well as physical and mental growth.