Jim, the chorus that's repeated is just this part:
She brings her father, her mother,
Her sister and her brother.
    Oh, I never see Maggie alone.
She brings her uncles, and cousins.
She's got 'em by the dozens.
    I never see Maggie alone.

This part varies throughout the song:
And if I phone her, say to her, "Sweet,
Where shall we meet?
Supposing that we eat,"

Then the repeated refrain:
She brings her father, her mother
Her sister and her brother.
    Oh, I never see Maggie alone.