Of brothers-in-law and red dogs few are good.
More Spanish Proverbs:
Tell your own story first.Spanish
Of your wife and your tried friend believe nothing but what you know for certain.
Spanish
Give a traitor good words and you make him loyal.
Spanish
Cleaning a blot with blotted fingers maketh a greater.
Spanish
He that makes one basket can make a hundred.
Spanish
There is nothing like deprivation to generate thanks for small mercies.
Spanish