I'm good Dad

Ei mitään.
I'm good, Dad. = Isä, minä olen hyvä.
I'm a good dad. = Olen hyvä isä.

Wikipediasta:
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Parenthetical phrases

Commas are often used to enclose parenthetical words and phrases within a sentence (i.e., information that is not essential to the meaning of the sentence). Such phrases are both preceded and followed by a comma, unless that would result in a doubling of punctuation marks, or the parenthetical is at the start or end of the sentence. The following are examples of types of parenthetical phrases:

Introductory phrase: Once upon a time, my father ate a muffin.[9]
Interjection: My father ate the muffin, gosh darn it!
Aside: My father, if you don't mind me telling you this, ate the muffin.
Appositive: My father, a jaded and bitter man, ate the muffin.
Absolute phrase: My father, his eyes flashing with rage, ate the muffin.
Free modifier: My father, chewing with unbridled fury, ate the muffin.
Resumptive modifier: My father ate the muffin, a muffin which no man had yet chewed.
Summative modifier: My father ate the muffin, a feat which no man had attempted.

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Eli isän (parental word) kanssa tulee pilkku?