My brother and SIL live in Florida and just recently moved from their land. They had a lot of vegetation on their land and were outside a lot and never contracted Lyme disease. They'd walk their dogs and when they got back home, they'd always pick ticks off of the dogs and themselves.
Have you been on this site?
www.cdc.gov/lyme/prev/on_people.html . I wouldn't be anxious to use those repellents, if I did, I'd just put them on my clothes and tuck my pant legs into my socks and tuck my shirt into my pants.
You might consider getting pool, since kids love water and spend as many hours as they can in a pool. That would keep him out of the vegetation part of the time. I'd suggest a Splash pool since they're sturdier than the metal sided pools with a liner that has to be replaced every so often. They don't have to be completely level either. We've had one for at least 10 years and it's still in good shape. They do cost more, but they last a long time.
I don't understand what the problem with trees is. I've only heard that grass and brush are problems.
Us females have a part of our brain that that males don't have that makes us more attentive to our kids, so that's what makes us more concerned about
them.
Whether you live in town or in the country, other animals are carriers, such as rodents, rabbits, birds, etc., so no place it completely free of them. Not that I want to cause you more worry!
I heard someone talking about
using essential oils as a repellent, but I don't know which ones. It might be worth looking into if you don't want to use the others.
You've taken the necessary precautions, so try to enjoy your land. I understand your concerns.
I know some people do a tick sweep, which is putting a flannel cloth on a stick, like a flag is done, and drag it along the ground and then they send any ticks it picks up to a lab to find out if they are carriers. I never heard what lab they get sent to, but it might worth checking out. Maybe the Lyme doctor you know of could tell you.
Eating a good diet and keeping sugar low, plus consuming foods with probiotics in them or taking a probiotic supplement will help keep your immune systems stronger. A lot of leafy greens and other vegetables is good for you. If you start your son on them while he's young, he may like them better when he's older. Getting organic produce is best.
Also, living where you do, there is a lot more awareness of Lyme disease, unlike the NW where I live, so you would be likely to get a quicker diagnoses if you did contract it and would get over it faster by catching it early. You've already learned quite a bit about
it too, so you're ahead there.
That's all I can think of for now. I hope you will be able to relax more and enjoy your property. We live on wooded property and like it a lot.