Wedding Invitations

How should my parent’s names read in my wedding invitations, if my mother kept her maiden name?

The easiest way would be if she would agree to using “Mr. and Mrs.
Stephen Andrew Sampson” for the purposes of the wedding invitation. The
other way would be to print your mother’s name on the first line of the
invitation and your father’s name, preceded by “and” on line two. In
this format, no titles are used.

My father has a Ph.D. Does he use “Doctor” on my wedding invitation?

No, Ph.D. is an academic title that is reserved for academic
settings. The use of “Doctor” is reserved for medical doctors and
ministers with advanced degrees.