Family visit visa- sponsor query

[lovnishs]

Hello,

I wanted to sponsor my Parents(Mother & father), my sister-in-law and her son altogether for their visit in UK at my residence.

I understand for my parents it should not be an issue as they have already visited my place on family visit visa.

My brother is already in UK on Tier-1 Visa however unemployed as of now.

I need to enquire regarding sponsoring my sister-in-law & her son. As my brother is not working in UK at this time, I am thinking to sponsor my sister-in-law by myself instead of sending sponsorship through my brother.

Could you advise if its okay to sponsor sister-in-law and naphew.

I am going to make all the financial arrangements & their tickets, accomodation.

In particular, please advise any extra documents to be presented?

Thanks in advance