I agree with the other posts about the damages element. Thankfully your son was OK. I would follow the advice in the other posts.

Will I be sued on a subrogation claim and if so will I be expected to pay in full?

Based on these facts it is unlikely you will be personally liable since your policy limits were paid.

I am being asked for my vehicle registration registration to renew a parking pass. Is that legal?

I agree with the other posts that there in nothing nefarious about this request.

I was rear end and I didn't have insurance

As posted by the thorough responses of others, you can make a claim against the at fault party, You have a separate issue with DMV over a license...

Should I get my own lawyer or let my Nationwide appointed attorney handle the lawsuit.

Attorney Fabiano has posted a thorough and comprehensive response.

How can I be charged with DUI when I was not driving

You need to fight this and will have a hard time prevailing on your own.

Can an accident be remove from your driver's record.

As stated in the other posts, there are driving classes you can take to help your driving record. The accident, however, can't be removed.

Can I appeal denial of fmla if my partner and I are not registered with the state as Domestic partners?

This is an employment law question so you should repost it there.

How should I proceed with consolidated case?

Agreed with the prior post that this is a complex decision, not of the sort that can be answered on Avvo.

You could try Googling the question and you might find a tech blog. Techies love to talk shop.