You can keep them with you on a visit visa if you keep applying for extensions every 6 months but you would have to pay for their medical care since they would not be covered. At the same time, you can be working on sponsoring them.
Thanks Leon
Im plannning like this and ill take care of medical etc, but im worrying that this process will take 5-7 years or more and they have only 3 yrs visa. Is there any other possibilities.
Awaiting your valuable suggestions please.