I watched this anime/cartoon in 2010 - 2011. The main character was a teen boy. Apparently he lived in a house with his mother and his little sister (?) which was located on a floating piece of land (floating in mid-air). One day the boy was taken by some people in flying vehicles because of something his mother did (?) or because he needed to fight for them against others. I think his mother fell on her knees when they took him away and she was crying. The other scene I remember was him racing with a girl which apparently he liked, on those flying vehicle things, and she won. This anime/cartoon might fit in the category of mecha and/or space. Also I watched it on a Macedonian TV channel called Kanal 5.
Could this be Skyland? From Wikipedia:
It is the 23rd century; the Earth has shattered into billions of pieces which orbit around a central core. In this new world named Skyland, an evolved form of humans has appeared: Seijins, who are able to absorb energy from sunlight and use it to fuel special abilities such as telekinesis, telepathy, mental control, astral projection, energy balls or blasts and electricity rays.
The Skyland is ruled by the Sphere, an organization which controls the fragmented blocks water supplies and maintains its power thanks to Guardians - promising Seijin children who have been taken away from their families and given a special training. This dictatorship is fought by pirates.
After the capture of their mother by the Sphere, Mahad and Lena, a young Seijin still learning to control her powers, are rescued by a group of pirates. They join the pirate rebellion, determined to free their mother and help bring the Sphere down.
If the guy has a sister, and all 3 of them have dark hair, then it's Skyland.