NIH postbac 1098-G

My son has started as a NIH postbac starting to do research later in 2019.  For filing taxes do I still list him as a full time student and a dependent for our taxes?  For his taxes is he considered a MN or MD resident?  They said he had to get a MD driver license within 60 days so he did.  So is he still a MN resident or did that change when he got his MD driver license?