Re: What is the difference between families and marriages?

From the help of Legacy on Family, Information.
"Content Information
The content section shows:
The number of individual records in the current Family File.
--->The number of Families (marriages). <-----
The number of unique surnames (just for fun).
The number of Master Source entries."

Legacy Families and FTM Marriages are one and the same.

Also do you have any single parent "Families" included in your data?