You will need to mail in Form 4506-T to obtain the transcript. The transcript you will need is the Form W-2, Form 1099 series, Form 1098 series, or Form 5498 series transcript.
Because you are not requesting a transcript for yourself you will need to have your nephew sign the request or obtain a Power of Attorney allowing you to sign the request for him.
If you obtain a Power of Attorney (POA) to sign tax forms you can use the POA to sign his returns when you complete them for him.
When you get ready to file his 2018 return you can download the 2018 software from TurboTax at 2018 TurboTax Software.
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