Hi,
I am living in Zurich on a l permit. My parents visited me from jul 24th 2011 and stayed here for a period of 45 days. They were issued a 90days visa and the visa is valid till Jan 4th 2012.

Now I want my parents to visit me again in the months of Jan and Feb 2012. But looks like if they can enter only after .180 days after their first entry to Switzerland . Now my query is there any way this can be done and they can stay with me in Jan and Feb?
If I calculate180 days from jul .24, it will around Jan 20th 2012 when they can get a new visa. But this will jot help me.
Is there a way their old visa can be annulled , and they apply for a new visa from Jan 1st.
Is this possible? Has anybody done it?

Thanks in advance
Rani