I would make it as simple as
My application of June 22nd 2016 was refused.
As it was urgent for me to visit my home country due to family problem while on implied status, I applied for Visitor Visa to return to Canada, while my PR file is in process. The officers were not convinced for reason unknown, and refused my Visa.
Note: Never give personal reasons like father's eye surgery, and keep an window open for further explanation when required.
Thanks a lot Best of Luck
If the reasons were explained verbally, you always say reason unknown, and if they give you printed refusal letter you need to upload