I'm sorry to say that the Gifford name doesn't come up in my family. Amanda Vredenburg born 1829, she could have been a sister of my Joseph H. V. He was born, according to the one census on which he appears (1850), about 1820. They were from Barry county, Thornapple/Middleville. Other names associated with his family were Paull, Coman, McNitt, Worden.
Have you checked the records in newspapers for that time period. Where did they come from in New York, my Vredenburg family came from Middleville, Niagara, NY. That's where his wife, Rebecca Jane McNitt was born, I don't know where Joseph H. came from.