Fill-in-the-blank select the correct form of the pronoun in parentheses. george washington, (who, whom) is known as “the father of his country,” was the first president.

The correct answer is who because whom should be used as the direct object of a verb or preposition. Also you can try the trick where you replace the blank with he or she. if it makes sense then you use whom. If not then you use who.

umm we do not your answer or what you are talking about