You will probably need two lenses:
1. Wide angle lens. This lens will be useful for indoor group or full body photos, and outdoor landscapes.
Tamron 17-50mm f/2.8 (~$450) or Canon 17-55mm f/2.8 IS (~$950)
2. Telephoto lens. This will be useful for performance and outdoor sports.
Sigma 70-200mm f/2.8 (<$800) or Canon 70-200mm f/2.8L IS (~$1600).
1. Wide angle lens. This lens will be useful for indoor group or full body photos, and outdoor landscapes.
Tamron 17-50mm f/2.8 (~$450) or Canon 17-55mm f/2.8 IS (~$950)
2. Telephoto lens. This will be useful for performance and outdoor sports.
Sigma 70-200mm f/2.8 (<$800) or Canon 70-200mm f/2.8L IS (~$1600).