Edible?

After a few rains, I just noticed something on my citrus tree outside.

This past spring, for the first time in quite a while there had been some flowers.  Then the flowers were blown away, and I pretty much gave up all hope.

Many years ago I bought a lemon tree from a proper nursery and planted it.  To say "It was a lemon" is a rather sick joke, since we never got any lemons from it.  About sixteen years ago my elder son brought home a small seedling that may be an orange tree.  He planted it near the lemon tree.  I can't remember which is which, since we never get fruit from them.  Maybe this is from his tree.

It's still a bit early in the season.  I wonder if they are edible.