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What material have you specifically researched on Cary & Young in the Greater Newbury / Newburyport area? The VRS? Older family genealogies? Done a Register search here? Done a global VR search here for those names? etc.
Have you tried to work out the possible family relationships from those sources, including Essex County Probate & Deeds (sorry, volumes not personally to hand anymore & they don't go as far as you need)?
If you haven't searched the Register for a major article or minor notes on either of these families, you really need to do so.
Let us know or (gratuitous plug for whenever the next Come Home to New England is) CHTNE and bug Dearborn and the staff. But first, exhause the Society's online resources.
Let us know.