I have been digging around and have found some items that may interest you. I have found Elizabeth Ann DOWNEY in the 1861 census, the marriage of John and Elizabeth, the 1871 census entry for John and Elizabeth, and directory entries from 1907 for the sons of John and Elizabeth.
I am the webmaster for the Alderson Family History Society (www.afhs.org) and I collect data and research Alderson families everywhere in the world.
I am a bit lacking in data for Nova Scotia. I am prepared to dig around and swap data.