Sorry, I could not locate Kalnin's 4th and 6th symphonies here, can you help?
Also there are other composers with the last name of Kalnins in the download section. Were they all family?
Symphonies Nos. 4, 5 & 6 are in this post:
http://artmusic.smfforfree.com/index.php/topic,533.msg6333/topicseen.html#msg6333Possibly you were unable to retrieve it if you weren't searching with diacritical markings.
Jānis and Alfrēds Kalniņš were father and son. Imants Kalniņš is not a known relation of theirs. There is also a composer named Indulis Kalniņš, who is also not related to any of the previous. Actually, one of my paternal grandmothers' maiden name was Kalniņš, again no relation. While not quite a "Smith" or "Jones" it's a fairly common surname in Latvia.
