Ms Jensen's partner,Terry Harris, had a grandfather who fought in World War One as well.
He came to the service with photographs of his grandad, Thomas Samuel Harris, in his pocket. He also wanted to remember his grandad's two brothers, Jack and Roy, from Sanson and Raetihi.
They also went to fight in the war. Roy was wounded and died later, in New Zealand, of those wounds.
"We're here out of respect for those who have gone before us, and the sacrifices they made," Ms Jensen said.
There were about 18 people at the Cenotaph for the brief service, taken by Whanganui Returned and Services Association president Graeme Paul, Padre Stephan van Os and bugler Mac McCallion.
Mr Paul said the Battle of the Somme was the first major engagement New Zealand soldiers were involved in. It took "a huge toll", with one in seven of the soldiers killed.
Revd van Os gave a prayer for peace and protection, and two wreaths were laid.