Frank wrote in
:

Look for garden sprays effective against ticks. Use DEET and
long clothing, tight fitting around hands and feet.

DEET should NOT be used on children. a DEET free insect repellent
should help, but keeping the grass short & the child away from shrubs
& tall plants (where ticks are likely to hang out) is usually
sufficient. there's no reason to keep a child out of the garden
because you found a bug.
if you have cats or dogs, get them on a spot treatment for fleas &
ticks, like Advantage or Frontline. you might get chickens. they eat
ticks.

Often bullseye rash is a sign of Lymes disease. Don't think its
carried by the much larger dog ticks.

all tick species can carry Lyme disease. only a third of the cases
get the "characteristic" bull's eye rash (and spreading rashes could
have another cause. my son got cellulitis from a deerfly bite last
summer).
lee