Moracxewski, you make one big mistake - you compare every word with Russian.
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Yes, I am agree, how can I compare every word with Polish or Czech without speaking Polish and Czech?
Slovio is all-slavic language, and claimed to be understandable without study for 400 million speakers, including me. So if I don't understand "rodzin" as "family" and "priazn" as "sympathy", how can you be sure that the rest 399 999 999 speakers will understand it also?
If someone says that they don't understand "rodina" and "prijazn", then OK, it's to think further.