Hi rashonna -
As we don't know anything about you and/or your family's interests, the best place to start would be a good guidebook but my personal list of favorites so far includes but is not limited to:
Musée de Cluny
Notre Dame Cathedral/towers
Église de Saint-Germain-des-Prés
Top of the Arc de Triomphe
Dôme des Invalides
A walk about Père Lachaise or Montmartre cemeteries, Jardin des Tuileries, Jardin du Luxembourg, the Marais, Ile St Louis and Ile de la Cité , Montmartre and too many other places! Skip Champs-Élysées.
You'll notice I left the Eiffel off the list? We wandered over to see it from the ground - Esplanade du Trocadero is a great viewing spot at night - but didn't have a huge desire to go up in thing. We also didn't shop at all. So, you see, everyone's must-dos can be different!
I'll highly recommend purchasing the Paris Museum Pass. We're not usually big on tourist passes but this one is especially good, and if you're interested in enough of the attractions it covers, you can even break even on thing. You don't have to purchase it in advance - buy it when you arrive in Paris - and don't confuse this one with the overpriced Paris Paris.