Hi Ken,
I'm Bruce, the club's chief instructor. (Just starting in the role this year, however I have been an instructor for a number of years.)
You, your son and grandson can join the club by following the instructions provided at the TEMAC web site
http://temac.ca/?page_id=5.
As noted your grandson can likely join the club free as a junior member, provided an adult joins as well.
Everyone that is a flying member of the club also has to be a member of MAAC (Model Aeronautics Association of Canada). You can join the organization by going to the following link.
https://secure.maac.ca/members/en/join.php As indicated junior MAAC membership fees are significantly less than that for adults.
TEMAC will be starting it's weekly Wednesday evening free instruction classes in the spring. Last year classes started early in May and continued into September. Classes will likely be held for the same duration this coming year.
You and your relatives are embarking into a great hobby. Please review the TEMAC website information about flight instruction, getting started, club rules and other club posts, so that you can get a feel as to what TEMAC is and information about its members.
I look forward to you and your family joining TEMAC and taking on the opportunity to obtain your wings.
Should you have any questions feel free to post them on the forum, or you can send me a personal message.
Thanks
Bruce Weaver