Fill in the gapes.

Russia has always had an extensive system of family ... .
Of course, this system exists in other countries, but few countries have a separate name for each type of kinship. For example, sister's husband, brother's wife, husband's father, husband's mother, son's wife, cousin's daughter and so on - everything has its naming unit. And in Russia ...
parents and ... parents are also relatives. A large number of close relatives for Russian people is great wealth. In modern Russia, of course, the big family of several generations already go into oblivion. In the series problem of the modern world, people began to step back from each other. The number of divorces outstrips the number of marriages.
A ...
with one child is more customary than the family with 2 or 3 children. Family with 3 children in Russia belongs to the category of "many-children ... ", and such families are paid a small allowance, and the mothers of 3 or many children are given a symbolic diploma of "many-children ... ".