How long has he been out of Canada? And how much time has he spent in the past 5 years? Are your parents separated? If they weren’t they would have been able to share a room so wouldn’t have needed extra space. It sounds like your parents have multiple children in Canada who could have provided both space and financial support. Has your sister returned to work and increased her savings because expenses will only increase as parents age for things like special equipment, paying for public longterm care, needing to be a caregiver so not being able to work, etc.