When you take the effort to write a blog post about your ancestors, you want people to read it. A good way to get more exposure for your post is by always adding an image, because a blog post with an image can be pinned on Pinterest and shown on Rebelmouse.
It doesn't have to be a fancy image. It can be an old map of the area. In winter you can add a nice local winter landscape. Maybe you can show a small object mentioned in the post. You can always add a small image with flowers. A nice way to create an image matching a specific post is to use Tagxedo to create a matching word cloud picture.
These are some examples:
|A Tagxedo Word Cloud|
|An old map of the area|
|A small flowery image|