*Myself & my spouse moved to UK around in Oct08.
*We had a premature daughter born in England in Dec08.
*We are planning to get the daughters Grandmother here from India for a visit for about 6months, just as to cope with initial upbringing of the new born baby & as the mother of the baby also needs a bit of emotional support, (I'am sure all the mothers will agree

*I am working full time for a corporate firm, & have a contract till May2011, possibly might get extended or I may switch to available options.
*Myself & my wife are here in UK on the Tier1-General & Dependent Visa respectively(expires in the Sep2012).
*We reside in a spacious 1bed in London.
Does inviting the infants Grandmother generally needs a specific reason or could be just visiting normally & would not need anything specific. If not then what kind of documents I'll should be prepared with?
If anyone could otherwise please throw some light on this.
Thanks in advance.

-tot