Is traveling to the British Columbia and Alberta parts of Canada a bad idea right now?

My family is planning a trip to tour Vancouver/Whistler/Banff and some other places. We plan on flying to Seattle, renting a car and driving to most of the places in Canada. But my dad spoke to his friend’s son (who lives in Vancouver) and he warned that it will be very cold and that driving near the mountains at this time is not very safe.

But I would like a second opinion about this before I cancel all the work I have done towards planning this trip. Answers from Canadian residents or those that have visited these cities around this time would be most helpful.

We would reach Seattle on May 23rd and leave for Vancouver the next day. The trip is supposed to be for about a week.

Thank you!