The context of the following conversation is Jan considered the arrangements in detail finally deciding that Others should not be allowed to attend.:
Jan says I don't want to invite those people because I do not know them very well.
The friend responds That sounds like a good idea and you can save yourself some money on the dinners too..
Jan responds I think we can replace them with my step-sister's family..
The friend responds That sounds like a great idea. Just let me know who to add to the list..