"Blood
is
thicker
than
water"
is
a
German
proverb
(originally:
Blut
ist
dicker
als
Wasser.),
which
is
also
common
in
English
speaking
countries.
It
generally
means
that
the
bonds
of
family
and
common
ancestry
are
stronger
than
those
bonds
between
unrelated
people
(such
as
friendship).