Visitor Visa for Handicapped father in Law

[badymuka]

Hello,

I am planning to apply for a Visitor Visa for my In laws.

My Father in law is Handicapped (Can not walk,no bodily sensation below west since last 8 yrs) but no health issues with Mother in law.

Can he get Visitor Visa?

If yes ,Is there any special instruction to apply ,any specific inter Interview questions to look for ?

If No,what are the chances of getting Visa for my Mother in law if they are giving Visa Interview together? Shall I book the interview separately ?

Note:- I am on H1-B and VI will be at Mumbai consulate.

Thank you.