An acronym is a word or name formed as an abbreviation from the initial components in a phrase or a word, usually individual letters (as in NATO or laser) and sometimes syllables (as in Benelux). There are no universal standards of the multiple names for such abbreviations and of their orthographic styling.
Son and daughter of your siblings and siblings-in-law. As with uncle and aunt, they're not your nieces and nephews by marriage, they're your nieces and nephews, plain and simple, even if they're your spouse's siblings' kids and don't have a single drop of blood in common with you.
A first cousin marries a first cousin and the couple's own grandparents are cousins, too. I have heard of first-cousin marriages going back generation after generation in some families.Fathers who are also brothers may overtly or covertly share sexual relations with the wife of one or the other. . . .irst cousin marriage is allowed without restriction in 19 states, and with some restrictions in AZ, IL, IN, ME, UT, WI and NC (in North Carolina, while first cousins may marry, double cousins may not-more on this one in a bit.).