Why do mid latitude cyclone occur in families all year round ?

Mid latitude cyclones occur in families all year round because they are driven by the jet stream, which is a fast-moving band of air that circles the globe in the mid-latitudes. The jet stream is strongest in winter and weakest in summer, but it is always present. As the jet stream moves, it creates areas of low pressure, which can lead to the formation of mid-latitude cyclones. These cyclones can form in families, with one cyclone leading to the formation of another. This is because the jet stream can create a chain reaction of cyclones, with each one leading to the formation of the next.