For -- (OS) There is nothing in the Greek that can be translated as "for" in the source we use today but it does exist in the source that the KJV translators used. It appears in Matthew 12:50 version of this verse but not here.

whosoever-- "Whoever" is from a special construction connecting a pronoun with a conditional particle. Together, they begin a relative, conditional clause that refers to each individual person or thing.

shall -- (CW) This helping verb "shall" does not indicate the future tense, but that the verb describes a possibility, the subjunctive voice. A "might" or "should" in English is more appropriate, but is assumed in an "if/when/whoever" clause as it here. Helping verbs are not needed in Greek since the main verb carries this information in its form.

do -- The Greek word translated as "to do" has the primary meaning of "making" or producing" something or "causing" or "performing" as service. When it means It describes a productive action.  In English, "do" is also frequently a helper verb. This Greek word is not used as broadly.  The sense here is closer to "perform."

the -- The word translated as "the" is the Greek definite article; without a noun, it has the sense of "the one." The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those") than the English "the." See this article for more. 

will -- The word translated as "will" means what one wishes or has determined shall be done. It also means a desire or a choice.

of -- This word "of"  comes from the genitive case of the following word that requires the addition of a preposition in English.  The most common is the "of" of possession.

missing "the"  -- (MW) The untranslated word is the Greek definite article,"the," which usually precedes a noun and, without a noun, takes the meaning of "the one." The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those"). See this article for more. 

God, -- The word translated as "God" means "God" and "deity." It is introduced with an article, so "the God," "the Divine" or "the divine one." Jesus often uses it this way perhaps to indicate the one God as opposed to the pagan gods.

the same -- (CW) "The same" is translated from a Greek adjective that means "this," "that," "the nearer." Without a noun, it has the sense of "this one" or "that one." It is in the form of a subject.This is a different word than the one translated as "the same" in the parallel, Matthew 12:50.

is -- The verb "is" here is the common form of "to be" in Greek. It means to have a certain characteristic or remain in a certain condition. It also equates terms or assigns characteristics.  The word also means "to exist" and where it doesn't connect to characteristics or conditions. However, this verb appears at the end of the sentence. Since all the subject nouns appear before the verb in the form of the subject (as are all the pronouns at the beginning of this verse) an "is" would be assumed before coming to it. 

my - "My" is the first-person possessive singular pronoun. This pronoun follows the noun so "of mine." 

brother, -- The word translated as "brother" means a biological brother, any kinsmen, and more broadly and friend or associate.

and - -- The Greek word translated as "and" is used as the conjunction "and," but it also is used to add emphasis ("also"). In a series, it can be translated as "not only...but also."

my -- (OS) There is nothing in the Greek that can be translated as "my" in the source we use today but it does exist in the source that the KJV translators used. 

sister,   - "Sister" is female forms of the word that means "kin," and generally it means "child of the same mother."

and The Greek word translated as "and" is used as the conjunction "and", but it also is used to add emphasis ("also"). In a series, it can be translated as "not only...but also." After words implying sameness "as".

mother. -- "Mother" is the common Greek word for "mother" and "grandmothers," but it also means "the source" of something.