I find myself wandering; "If we find life on Mars will it be related?"

Meteorites originating from mars do land on earth. Surly rocks from earth have found there way to mars. Perhaps taking life with them? We are losing some of our outer atmosphere all the time, surly some microbes must escape also? They would face the cold vacuum of space and all that radiation, dieing a cold lonely death. But give our microbe a big enough rock of the right type, and there would seem to be some hope of survival.
Have you got a relative on Mars?