From my keen observation the water vapor in the cloud turns into ice particulate and bumps into each other so there is region with more electrons than the rest of the cloud, but lightning should form between these 2 potentials inside the cloud instead of striking someone or something on the ground? Why is the ground or object on the ground become positively charged whenever lightning occurs?
Most of the time lightning is cloud to cloud. The ground is generally positively charged and when a cloud becomes negatively charged, lightning goes from ground up to the cloud. Edit: because opposite Attract the cloud may reach down with a streamer but the positive charge goes up from the ground.