Dependent Visa Documents for long terms stay in Belgium (Type - D)

Hello All,
I am currently working in Belgium as an internal employee for a local bank with indefinite contract.
I understand from the official site , i need to submit the following docs.

From Sponsor end :

RP
Employment Contract
Rental Contract -
(Currenty i am staying with other friends in BBF and i am not the owner in the contract , will it be a problem?)
Bank Statement
Payslips
Insurance
attestation de mutuelle (To confirm that my dependents will be sponsored their insurance when they arrive)

From Applicant :

Passport
Visa Application
PCC ---> Need to be legalized (not required for my 3 years old son)
Medical ---> Need to go for medical check up
Bank statement (Not required for my 3 years old son)
Birth Certificate ---> Need to be legalized ?
Marriage Certificate ---> Need to be legalized ?

Do we need to submit the confirmed tickets at the time of application ?

Do you see any other docs are required and any idea now how much time it is taking ( i am planing to bring them by end of march)?

Thank you for your response.

Reagrds
Bhanu

There are many threads in the forum that discusses dependent visa documentation. Please read through.