Why is だそうだ not accepted here ?
Because そうだ is not very casual, just regular casual. 
Got it. A hint would help though (“more casual than this”)
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Example sentence question:
父親だって、たまには<一人
But the help page says that I should have (なん) before a noun, and when I try that it says “try removing something from the front.”
There are parentheses on the help page, but I’m confused because of the linkage between the noun and the expression.
Hey @larrydeluca !
なん will be added between a noun and だって when it is used at the end of a sentence to express hearsay.
Since this だって comes in the beginning of the sentence, adding なん would sound unnatural since this is not expressing hearsay.
I hope this helps!