Mechanic please, on going problem with ford galaxy.?

Cheap freakin' tires. Front drive cars require a more durable tire, because the front wheels do so many jobs at once. If I were you, I would use only Michelin "green x" or Bridgestone Turanza tires. These will actually save you gas money because of their intrinsic design. Have your tires examined by another tire store. Good luck!!