For medical you need to take an appointment at a designated hospital as mentioned on the cic website. Take the appointment as close as you can to the date on which you plan to send your application, as it is valid for 1 year.
Family information needs to be filled in tha form titled as additional family information. You should attach as many proofs of your relationship without any loop holes in your application package. Remember, focus on the quality of proof rather than the quantity.
I recommend that please go through the information guides throughly before you send in your application, so that you dont miss out on any thing.
Wish you all the best.