Household groups

I had an Excel spreadsheet and I grouped couples/families into the same cell, with things like address and phone number in the same row.

That was where I found the Knot's website helpful. They have a tool where you can enter in family groups/address groups, and it will tell you how many of those groups you have.

I haven't deleted my account, either, because it has so many addresses, by last name, all listed!

1 per address is how I would do it.

I agree, I sent one per address unless they were separate family units. For example, I had a husband and wife with their 18-year-old daughter for one invitation, but their married daughter and son-in-law also live with them. They got their own invitation.

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Exactly this! The Knot made it so easy when sending save the dates and invites!