“Blood is thicker than water”, when used in the context of family over friends, is in fact a wildly incorrect bastardisation.
The true, full quote is “The blood of the covenant is thicker than the water of the womb,” and refers to relationships forged by choice holding deeper meaning than those of mere biology.
•“Come on Sherlock! We will discover universe’s misteries! You, Castiel and me (maybe in my different Doctor faces)!” •“Why should I, “Doctor”? This is so boring… I’M BORED” •“But it’s the Solar System!!”
All the time