wintertime on Family Tree Circles

I am looking for information re the McGiffert family who lived in County Down, in Particular Mary McGiffert. She was the daughter of John McGiffert, married to Mary nee Dunwoody, born C1798. Has a brother Robert, and sveral other sibblings. She married Hugh Cleland.

Can anyboby assist ?

Joseph, b abt 1836, and Brother Robert, b abt 1835, immigrated to New Zealand from Ireland in late 1800s. They were the sons of John and Mary, nee McGiffert.

In NZ, Joseph married Annie Dixon, and Robert Mary Mabey.

Can anyone assist with the Irsh history? ( I believe Belfast area )