google-site-verification=bnBP1YyOvuNNXqyApA17fvUkhP7WppjepahXbV6qTvg "Sociology is a social science"(সমাজতত্ব এক সমাজ বিজ্ঞান): Kinship system in Assamese language,kinship, kinship: principle and pattern(kinship system)