It’s entirely legal to do what he’s attempting, so long as the DVD is for his own personal archival use, and so long as he keeps the original VHS. Should he throw or give the VHS away, he would also need to throw away the DVD copy. The fact that the medium of archive is different than the original source makes no difference under fair use. These rights are firmly established and supported by the courts and law.
However, what’s more the problem is that it is almost certain the these Disney VHS tapes are copy protected with Macrovision. Even though it’s fairly trivial to subvert Macrovision’s analog copy protection scheme, the very act of doing so violates the DMCA and therefore opens one to legal liability, in theory both criminal and civil. If by some chance these VHS tapes are not protected by Macrovision, then he’s totally in the clear.
In practice, so long as he isn’t distributing anything and maintains possession of the original tapes, it’s extremely unlikely he has anything to worry about, from the ‘long arms’ of Disney or anyone else.