In 1770 he married Theodosia Tighe (1744-1817) from Rossana county Wicklow; their children were John (born 1771) and Mary (born 9 October 1772).
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William Blachford (born 1730; died 1773) was the father of poet Mary Tighe; from 1766 to 1773 he was librarian of Marsh's Library, Dublin.
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