if he is the main applicant and submitted all family applications together and responsible to pay all the expenses and family is totally dependent on the main applicant then IRCC will review the eligibility of the main applicant profile and take the decision whether all will approved or refused.... this statement is based on my personal experienceCorrect - your travel history is yours. Hers is hers.
Your background check is yours, hers is hers. I'm sure you wouldn't want to be jailed for a crime she committed! (example)
Hence your applications are handled individually. You could get a response faster or later, she could receive a rejection or approval sooner, and vice versa.