well, try to keep them away from each other and other sims if at all possible. let them rest and they should be ok in a few days.
your pets will not get sick on the sims 2 pets :)
The most common case for sims getting sick is from eating spoiled food.
yes people do get sick on Sims 1,2,3 they also have children and do many more things
Yes they can get things like the flu.
no
Sims, as in the sims 2, comes from simulation.
you can make a house with 2 floors in both sims 1 and sims 2.
both sims 1 and sims 2.
you can not
She wasn't sick, she was most likely alien pregnant.
There is no option to call in sick to school.
both because there cool because to me all the Sims are cool