I would write He is a friend of Dr. Roberts. The double possessive isn't needed here at all.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
Aspara GusI would write He is a friend of Dr. Roberts. The double possessive isn't needed here at all.Well, I am a little curious. If we were to replace Dr. Roberts with the pronoun her, would you say He is a friend of her or He is a friend of hers? I would go with the latter. In spite of the fact that a friend of Dr. Roberts's
Meathawkthe double possessive seems correct to meSure, but it's unnecessary.
Aspara GusSure, but it's unnecessary.I am not a big fan of the double possessive either, but some writers or teachers do consider it necessary. I only wanted to point it out because I know some students are tested on this subject, and depending on who is grading the test, it may be mark incorrect if the students leave it out.