During the pipeline, what opportunities do you have to see family?
During the pipeline you will be able to take leave in between schools to see family pretty much every other month until you get in to paramedic/apprentice course.
After A&S, do candidates get to visit home for any time at all?
I wouldn't count on it. You will most likely have time after dive school. Also, there will be time allotted during the pipeline to go home for holidays.