Sure. Please ensure that the connection is documented before adding him, as references are MANDATORY here on Wikitree. FamilySearch is a great source but many people there add fanciful records without justification.
The reference you have to David Peck is utterly inadequate. Look at some other profiles to see how it's done before continuing, especially for those profiles pre-1700. You should have at least a link to DOB, DOD (if available) and marriage (if available). Just adding "familysearch.org" is useless, it isn't a reference.