To make it easier to verify information when it was filled-in by other people, I would like to suggest adding fields to upload birth, marriage, death & other certificates (the scans from archives in jpg/.png format) in a similar way as you can upload photos.
What you'll want to do is add the picture as a "document". This can be done under the sources tab or the media tab. Once it is uploaded as a document, you can identify which fields the document supports for sources, marking that it contains birth, death, etc. On the profile, an icon will appear next to names or dates that have sources indicated.
Thanks, this is perfect :) Maybe the real feature to implement is something to make people aware of this feature as I managed to miss it for quite a long time !