After retiring from athletics Marshall returned to school teaching and went on to become headmaster of Southwell School in Hamilton, New Zealand for 16 years.
She told Metro magazine that she wanted the best education for them and "remarkably" was able to send them to King's School (Jonathan), Southwell School (Paul & Simon) and King's College (Jonathan, Paul & Simon) and St Cuthbert's College (Kate) despite being on her own after she and her husband separated when the twins were nine months old.
Southwell School is considered to be a feeder school for St Paul's Collegiate School, although significant numbers of its students go on to attend other schools, most commonly Hamilton Boys' High School and Waikato Diocesan for Girls.
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Upton was educated at Southwell School, St Paul's Collegiate School and the University of Auckland, where he gained degrees in English literature, music and law, and Wolfson College, Oxford, as a Rhodes Scholar.