Hi michaelfox11
Welcome to the forum.
You might want to have a look at the following FAQ which explains where everything is;
www.benefitsandwork.co.uk/guides-for-claimants/faq/forum Can I just check, you say you are your sons nominee, do you mean appointee?
If you are your sons appointee then you can fill out the form and sign it, I am not sure by what you mean when you say nominee, but if you are not his appointee then you will need to get your son to sign the form.
What I usually do if I complete a form for someone is under extra information state who I am and why I have completed the form with the input of the claimant and that I have read the contents of what I have written to the claimant.
Gary