https://www.thetech.org/ask-a-geneticist/articles/2015/double-cousins-share-one-quarter-their-dna/
How closely related are double cousins? - The Tech Interactive
closely relateddouble cousinsthe techinteractive
https://www.sciencenews.org/article/double-trees-city-trees-grow-bigger-country-cousins
Double Trees: City trees grow bigger than country cousins
Aug 8, 2019 - Clones of an Eastern cottonwood grow twice as well in the New York metropolitan sprawl as in rural New York State.
bigger thandoubletreescitygrow