The ForeignKeySource displays the table of the foreign key but not use the column name form that table.
   ,ForeignKeySource = ISNULL
        (
            (
            SELECT TOP (1) QUOTENAME(ss.name) + '.' + QUOTENAME(so.name) + '.' + QUOTENAME(c.name)
            FROM sys.foreign_keys AS fk
            JOIN sys.foreign_key_columns AS fkc
                ON fk.object_id = fkc.constraint_object_id
            JOIN sys.objects AS so
                ON fkc.referenced_object_id = so.object_id
            JOIN sys.schemas AS ss
                ON so.schema_id = ss.schema_id
            WHERE
                fkc.parent_object_id = c.object_id
                AND fkc.parent_column_id = c.column_id
            )
        ,''
        )
Alias c is for the column being displayed in the ColumnName column.