Tax filing and OHIP card - Any relationship

If she's living with you I don't understand why she wants to pay taxes in Quebec and keep her health card there? Here in Ottawa, lots of people that live on the Quebec side come here to get health care as theirs sucks.

My Father-in-law is in Quebec and they have always filed together and he shows her dependent.
At that age they are not looking for any change and want to keep status quo...

I had a discussion but they want to keep on filing their taxes in Quebec...

No relation whatsoever.

No need to cancel her Quebec Health Card either, if you don't want to. Technically you have to, but they won't find out if you live somewhere else, so most people keep it anyway. Lot of people go to other provinces , like Alberta for work, don't bother telling their home province & come back and start using their home province health card all over again.

You will need to bring these documents with you:

A. A completed Registration for Ontario Health Insurance Coverage form

B. Three separate, original (not photocopies or printouts of electronic documents) identification documents:

1. One that proves your Canadian citizenship or OHIP-eligible immigration status (e.g. Canadian birth certificate, Permanent Resident Card )
2. One that proves you live in Ontario (e.g. Ontario Driver’s Licence, income tax assessment)
3. One that supports your identity (e.g. credit card, passport from any country)

She already has 1 & 3 . Try to get something that shows she lives in ON - to prove 2 . An ON Drivers license, Utility bill, Credit card bill, Rental agreement, Bank statement etc, anything with an ON address or your home address on it & your name.