Mrs Luxton is a descendant of Dr Manley's eldest son and Miss Manley of his fifth son.
They travelled to Tauranga to attend the services after Miss Manley received an invitation to visit the country from her mother's cousin, Dawn Davenport. They attended last night's commemoration dinner at Trinity Wharf and were excited about watching today's services, particularly the Maori cultural elements.
"I've only ever seen the haka on TV before a rugby game so I'm quite excited to see that," Miss Manley said. "It's quite special because we've both been brought up with it by our dads, our family is very proud of him [Dr Manley], but he wouldn't have wanted a big fuss. "
The women visited The Elms on Saturday after watching the military re-enactment at Tauranga Domain.
Miss Manley described the visit as "atmospheric", particularly after viewing the dining table her great-grandfather ate around before the battle.
Dr Manley retired in 1884 as Surgeon General of the Army. He died in 1901.