It keeps them in orbit
The other planets do have gravity.
All massive objects (including all planets) have gravity.
The existence of large objects like planets or stars curve space and time. As the Earth goes around the sun it is in fact falling into the sun. The problem is that the sun and other planets are also moving. Gravity from the sun's previous location takes time to reach the Earth and planets such that the gravity from another location reaches the targets first. As the Earth and other planets reach a location where it might be moving in; the sun moves again, and other planets impart their gravity as well. The gravity of the sun becomes diluted throughout the heliosheath because of this weakening the effect of gravity even further.
All planets have gravity, not just Earth.
Gravity
No. Weight is affected by gravity.
Earth has gravity rather than other planets.
No. Of the planets in this solar system, Jupiter, by far, has the strongest gravity.
Simple. Gravity! The planets are dragged in by the gravity of the sun.
Because of Earth's size, and considering it as one of the smallest planets, it has a weak gravity compared to the OTHER planets. Most planets have greater gravity because of their size. Earth has a stronger gravity compared to mars, mercury, and venus.
The sun's gravity keeps the earth and the other planets in orbit around it
All celestial bodies exhibit some kind of gravitational pull on all other bodies. Hence, yes, it is very much possible to figure out the pull between the Earth and Mars. So yes, there can be, and is, gravity between our planets. Needless to say, the effect of Mars gravity on earth is overwhelmed by the effect of the suns gravity on earth. But it still exists.