Husband, Wife & minor Son is having GC for 5 years and hence all are now eligible for Citizenship application. The primary goal is to
1. Get Citizenship for Son.
2. Apply for GC for parents of Husband.
My questions are:
1. If only Husband applies for Citizenship and gets it then minor Son can become Citizen just by applying for US Passport? Also with this husband's parents application for GC can be done?
2. Is there any difference in cost and/or steps if Husband & Wife both applies for Citizenship versus only Husband applies and later after husband gets Citizenship Wife applies.
Thanks in advance.