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As far as guardianship records, there probably won't be very many, and any for a Marley or Morley I would check out. You might get lucky and pick up the name of the father that way. Then it would be easier on land and probate records. Probably lots of land records, but again, probably not as many probate records. A man might buy and sell land many times, but he will only have one probate. Then again, if the family fights over the estate, you might end up with more then you expected.
I had an ancestor who died intestate (without a will) in Ohio, and the family didn't fight, but it took a very long time to get the estate settled. They petitioned the sheriff three different times to auction off some town lots. The whole thing was in and out of the records for 14 years. In that time some minor children reached their majority and petitioned the court to remove their guardian, and some daughters were married -- picked up their husbands names -- and just lots of good "stuff."