H.C. Trumbull writes:

We, in the West, are accustomed to say that "blood is thicker than water" ; but the Arabs have the idea that blood is thicker than milk, than a mother's milk. With them, any two children nourished at the same breast are called " milk-brothers," or "sucking brothers"; [..] But the Arabs hold that brothers in the covenant of blood are closer than brothers at a common breast; that those who have tasted each other's blood are in a surer covenant than those who have tasted the same milk together. [..] that, indeed, blood is thicker than milk, as well as thicker than water.

Authors such as Albert Jack and R. Richard Pustelniak propose that the word "blood" in the modern Western proverb must originally have also referred to such a blood covenant, and suggest that "water" refers to "water of the womb". The meaning of the proverb then inverts to "chosen friends are more important than family". - Wikipedia

en.wikipedia.org/wiki/Blood_is_thicker_than_water

>uses wikipedea as source

>Thinking that someone's going to go as far as to fuck up EVERY SINGLE ARTICLE on Wikipedia just to make it un-resourceful

hahaha...dicker