Self-invited, on firm sense for, kin two words are to have divisional. Father the relative here, say to kiss; Mother the relative there, say for relative... it is relatives of a king or emperor on the side of his mother or wife of a relative on one's wife side, inside and outside has fasten.
Uncle, it is the husband of aunt, namely the husband of father's sister, of course of the standard consanguineous, with " father " say, beyond question; The husband of one's maternal aunt, it is the husband of maternal aunt, it is the husband of maternal sister, standard relatives of a king or emperor on the side of his mother or wife, with " husband " those who say, do not have cannot, say of course " uncle " OK also.
More than still, can say for what kiss, still include brother of cousin of aunty of uncle aunt, uncle, cousin, the relationship between the children of a brother and a sister; Include the relative of higher than father people of a certain kind, uncle uncle of father need not say, all can inspect than fatherly uncle, aunt close; And maternal beyond, even if is his uncle, also can be relative only.
Of course, this is alleged and feudal ethics " male honour female low " of the thought reflect, not certain and complete reasonable.
Be in Shandong of my native place, when junior marriage, sit a desk first, the aunt uncle that is father commonly -- old a form of address for a man used by the senior members of his wife's family of old married daughter...
Useful also of course to the uncle when, for instance a few sons in the home should break up, want support old person, at the moment is general the kin such as uncle uncle aunt is about evasive, should ask an uncle to appear personally redress the scales...