Please elaborate, who requested it? What is GST? If I'm not mistaken this is related to Canadian taxation.
Find some infos here:
http://www.canadavisa.com/canada-immigration-discussion-board/help-gst-reevaluation-after-reporting-change-in-marital-status-to-cra-t26847.0.html
Find some infos here:
http://www.canadainternational.gc.ca/philippines/visas/caregiver-aides_familiaux_residants.aspx?lang=eng
This thread is for existing live in caregivers who've filed for PR/OWP within Canada. Your sister is just applying as a live in caregiver.
After PR interview of LC1 and meeting all the required documentation, medical exams and requirements as LC2 we are just waiting for our visa stamped passports and COPR from Canadian Embassy Manila.
CENOMAR for married is called advisory on marriage, form for guardian is completed if you have a minor dependent child in custody of a guardian other than either of the parents.
You can, but be sure to submit the cic copy if you pay thru bank, or print out of receipt if you pay online and most importantly include it in the checlist you will submit.