Hi

I am a Sri Lankan citizen working in Qatar and I have visited china twice before. At that time I have taken Visa from Chinese Embassy in Qatar.
Next February I am planning to go to Sri Lanka & then visiting China again with my Mom & sister.
1. It will be a problem if I take visa from Chinese Embassy in Qatar and traveling from Sri Lanka?
2. My mom & sister needs to provide their bank details too? Or my bank details & my Chinese visa taken from Qatar are sufficient for issuing visa for them? (They have invitation letter from China relation)

Thank you