Did he pass out right away or after some time? Was the Toradol indicated? Was it administered in the correct dose? Does good and accepted standards...

Without provable damages this would be a nonstarter.

Statute of limitations likely long expired, generally two years after surgery. Please confirm with local counsel.

You would need to find aneurosurgeon to testify that the DBS was either not indicated or improperly performed so as to have caused these issues....

Nurses notes should be provided to the decedent's representative.

Take pictures of your wound and try to retrieve your medical records. If damages warrant cousult local malpractice counsel to protect your rights....

The damages suffered would really be the issue to allow for malpractice counsel to discern if they warrant a lawsuit.

Damages are quite limited as thankfully both your wife and child are fine. If the C-section scar is unsightly that is a demonstrable damage, but...

If everyone agrees to it, it is legal.

Statute of limitations likely expired. Confirm with local counsel.