"We already have a Scottish parliament with our own education system and legal system."
Their Rotorua-based daughter has lived in New Zealand for 14 years, which means she doesn't have a vote in the binding referendum. However she said it had formed a lot of discussion in her home.
"I hope that those who do vote have thought it through," Mrs Burborough said.
"Everyone is going to be affected. People vote on emotion, that's why there is so much campaigning."
She said a lot of her friends in Scotland were voting yes, to separate, but her parents were in the Better Together camp.
"Whatever happens we can't go back," said Mr Bertoncini, an Italian-born Scot who has lived in Scotland since 1948.
"It's not like a general election where you can change your vote and the government. No one can tell how it's going to go. It's the undecided people who can swing it. I don't know what's undecided about them.
"They're selling us a dream and it will take a few years to realise and a lot of money."
Polls close Friday 9am (NZT) but the result is not expected to be known until Friday evening. Voting is open to all British, qualifying Commonwealth and EU citizens, as long as they are resident in Scotland. Voting has been opened up to 16 and 17-year-olds for the referendum.