All answers are in the guide.
https://www.canada.ca/en/immigration-refugees-citizenship/services/application/application-forms-guides/guide-0002-application-canadian-citizenship-under-subsection-5-1-adults-18-years-older.html
Family applications: If more than one member of your family is applying for Canadian citizenship, send all of the applications together in the one envelope. The applications will be processed together. We will try to schedule family members together, but sometimes, it may not be possible
Thanks a lot for your prompt reply