Olive-backed sunbird feeding chick

I was waiting for the mother bird to lay eggs. The last two days, mother bird sat in her nest while I watered my plants. I did not have a chance to check the nest. Today I thought I came home to an empty nest but as I checked there was a chick in it. I waited a while and both mom and dad flew back to feed the little chick. Enjoy the video. The chirping is not from mother or chick but from the dad which is not in view.