Relations through water

Together forever
That's how the story goes
Blood is blood
What beats through my veins
Given by birth
Released by self
Thicker than water
But drips out the same
The blood that gives love
Showed only through pain
Each line like the last
The reasons the same
Time periods differ
Periods and generations
Each era creates
A falseness is built
Bonds relying on blood
Drop by drop it fades
The love is expected
Yet so hard to find
An unquenchable thirst
Not for water but blood.