I got old movie footage that was shot 30 years ago transferred onto VHS, and although the quality is....VHS, it means I can use it in a similar type production to yours but it is about the changes in the town where I live over the past 30 years. If you can lay your hands on any old footage, weddings, birthdays etc or what about visiting the local library and getting printouts of the front pages of newspapers from say the dates your grandparents were born on or got married on. They are usually kept on microfiche. Then photograph the pages and use them as date markers in your video. Any old buildings (schools, workplaces, churches, the old neighbourhood) aswell that are still standing or one that can 'double' for the original one that no longer exists.

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Better than a poke in the eye with a pointy stick any day...