Finding all foreign keys
SELECT src.name, srcCol.name, dst.name, dstCol.name
FROM sys.foreign_key_columns fk
INNER JOIN sys.columns srcCol ON fk.parent_column_id = srcCol.[column_id]
AND fk.parent_object_id = srcCol.[object_id]
INNER JOIN sys.tables src ON src.[object_id] = fk.parent_object_id
INNER JOIN sys.tables dst ON dst.[object_id] = fk.[referenced_object_id]
INNER JOIN sys.columns dstCol ON fk.referenced_column_id = dstCol.[column_id]
AND fk.[referenced_object_id] = dstCol.[object_id]