This video from the USA says about itself:
20 April 2016
Live – Baby Eastern Screech Owls in Nest Box
The oldest owlet is growing very fast – mother owl will leave briefly around nightfall (~8PM EDT) and we’ll see if the third egg has hatched. If it has not hatched it probably means it is not a viable egg. Father owl will have food right at night fall and continue to bring food through the night.