We only have one sun. It’s easy to check for yourself. Go out any sunny day. Block out the sun with your finger. Look above, below, to left and to right. Do you see a second sun? You have just disproved the idea that we have two suns.

This video shows what it would be like if we had two suns (or three suns in this case)

See also: What it would be like if we really had two suns (or three in this case)

Robert Walker's answer to Will Nibiru end the world in October 2017?

And: Debunked: Nibiru will hit or fly past Earth in September (or October or November) 2017 - David Meade’s “prophecy”