Give to both brothers the following sports items. It should be noted that you can give the same item to both of the brothers to beat the level.

Set 1: Baseball
Set 2: Soccerball
Set 3: Tennis Ball

Scribblenauts Remix 1-7 Cheats Hints gallery:
1-7-1-a: Help the step-brothers become friends! Their love of sports will bring them together.
1-7-1-b: The Brothers particularly enjoy baseball.
1-7-1-c: Give them baseball equipment.

1-7-2-a: Good job! Now the other brother needs something from the same sport.
1-7-2-b: What other objects are related to the sport you chose?
1-7-2-c: Give the other brother the same equipment.