Children who watch a great deal of television (and their families have
a history of near-sightedness) will probably require glasses sooner
than their peers who are not predisposed to myopia in these ways

1.
2. whose families have a history of near-sightedness
3. and a history of near-sightedness runs in the family
4. whose families have a history of near-sightedness running in them
5. with a history of near-sightedness running in the family