Rather than eat or eating

[Syazain]

Which of these two clauses is the correct one?

a) I want to eat that dish rather than eat the one cooked by your mom.

b) Everyone is helping the family rather than helping them.

 

[emsr2d2]

Sentence a) is correct (note that they are sentences, not clauses).
Sentence b) doesn't make sense. Who does "them" refer to?