Venus, because it is very similar size to Earth, and it is a rocky planet like Earth is.
It is Mars that is known as the red planet.
Uranus
Of the known planets, Venus is closest in size to the Earth.
Jupiter
Actually I believe that the asteroid belt between mars and Jupiter was Mar's sister planet. However it was destroyed somehow hundreds of millions of years ago and could have possibly stripped Mars of it's life giving atmosphere.
Venus is known as Earth's sister planet.
It is Venus.
Venus is know as being the sister planet of earth
Venus
Venus is the sister planet of the earth
Is mars known as earths sister planet
none
Mercury is earths brother planet because Venus is earths sister planet.
"Sister planet" is a nickname for the planet Venus.Specifically, the nickname is used to identify Venus as Earth's sister planet. The two are described as sister or twin planets. They in fact are quite similar in size and shape.
Mars is the planet known as the red planet
Mars is known as a red planet.
Venus Its sister planet