With new Super Visa rules, one can stay in Canada for 5 years and can extend their stay for another 2 years.
The Canadian Government issues a TRV to people having relatives in Canada. TRV is issued for business, transit and tourism purposes only.
If you are planning to go to Canada after 3 months, then you need to know the time the Canadian embassy would take to process your application. This process can take longer than expected. Make sure you have enough time after your application submission. Apply for visa at least 7 months to 8 months before you have planned to go. A minimum of 6 months will be taken by the consulate to collect information about you, the details you submitted in your application, confirm that information and so on
Applying for Canadian Super Visa
There are 2 options;
Fill in all the sections with required details. Do not leave anything blank as this can change the outcome of your application result. Incomplete applications are not accepted. Ask a qualified RCIC to guide you through the instruction guide if you are not able to understand something, but do not leave the questions unanswered.