Sentence 1: John and Mary wanted to have a balloon party. 
 Sentence 3: At the store, their mom bought a bunch of balloons 
 Sentence 4:  They blew up all the balloons in one room of their house 
 Sentence 5:  They played among the balloons and had a great time! 
 Option 1: They asked their dad to take them to the store. 
 Option 2: They asked their mom to take them to the store.