I arrived in the US in October 2016, I have my SSN and I saw now that the ITIN to my wife/son will take a while. Since I need this document to fill the form, how can I do to declare them in my form?

[robsontt]

I am here in the use with my L1 visa and my wife and son with their L2 visa.

[bine22]

you are a nonresident alien for 2016. Nonresident aliens cannot file joined returns nor claim dependents. There are some options to consider, like the first year choice and then the choice to be treated as resident aliens for the entire year (but you then have to report worldwide income for the entire year), but these need to be considered carefully. Have a look at publication 519 <a rel="nofollow" target="_blank" href="https://www.irs.gov/uac/about-publication-519">https://www.irs.gov/uac/about-publication-519</a>

[LinaJ2018]

You basically will apply their ITIN and filed your taxes at the same time.  

Per IRS, you cannot e-file your tax return with TurboTax due to the missing SSN or ITIN.  However, you can still use TurboTax program to prepare your tax forms and submit them by mail. 

-In the program, as you enter the information, leave the SSN space blank for your spouse and dependent

-After entering all your information, print out returns and required forms ( write APPLIED in the SSN space) 

-As TurboTax does not support the Form W-7, fill out the forms by following

 https://www.irs.gov/Individuals/General-ITIN-Information and attach to other required  documentation

-Submit everything including your tax forms to IRS Austin location in Texas.  ( Form W-7 instructions)