"The son has a son."
Translation:Der Sohn hat einen Sohn.
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Dec 11, 2015 - Anirudhmkonduru, perhaps you could start at the beginning of a German grammar site, review what you know and fill in the missing bits. These sites have free overviews of German with lots of detailed discussion. Then you will feel a lot less frustrated and overwhelmed. Coupled with Duo, you will be happier with your progress.
Those are my favorite sites, maybe others have further suggestions.
Oh! And here is a review of the cases in English, so it will make more sense when you are looking at German grammar.
Einen is accusative case. The first son had the second son. The second son did not do anything in this sentence. The first son only did something to him (having him). Therefore, it is accusative case. It's the same as the difference between I and me. Note that einen is not used for neuter nouns, in that case it's just ein.