| mod_summary = Presents tables of all cousins of an individual or all cousin marriages or in-law marriages in a tree.
| mod_validation = The mod is XHTML compliant.[[Image:Valid-xhtml10.png|44px]]
| download_link = | download_stats =
| mod_author = [[User:Chris Moss|Chris Moss]]
= [[ Private Media Mod]]
| mod_support = [http://mossfamilytree.info/suggest.php contact author]
| mod_contact = [http://mossfamilytree.info/suggest.php contact author]
| mod_version =
| min_TNG_ver = 10.1.3
| max_TNG_ver =
11. 1. 1
| TNG_file_list = relateform.php, relationship.php, cust_text.php for English, French
| related_mods =
Occasional examples are found in many family trees of cousins or other close relatives marrying each other. Although marriages between first cousins are illegal in many US states, more distant cousin marriages are permitted and may be more common than people expect. This display collects all the examples in a tree together. The display puts the names of the husband and wife alongside the names of their common ancestors with dates and places of marriage. The list is sorted by the closeness of the relationship and the date of the marriage.
The number in the "Descent" column shows the number of generations from the common ancestor on the husband and wife's side resepectively. First cousins are thus represented as 2:2, second cousins 3:3 etc. The reason for this is that it is possible to go lower. The picture at the right shows examples of nephew-niece marriages (1:2). Brother-sister incest is represented as 1:1 and father daughter incest as 0:1. The example of Louis XIV and Marie-Therese of Spain shows an example of double first-cousin marriage. Where only one of the ancestors is shared, a footnote annotation (*) is added in the descent column and only the common ancestor is shown.
The relationship can be explored by clicking on the husband or wife's name which will always show their marriage first followed by their other relationships. Clicking on an ancestor shows instead a descendancy tree in which the cousin marriage will appear twice. This also works where there is only one common ancestor.
===All in-law marriages===
Sometimes two siblings in one family marry siblings or cousins in another family. This strengthens the ties between the two families more than a single marriage but does not in itself bring any genetic implications. It can include affinal marriages such as a man marrying his dead wife's sister, but most such marriages are not properly described as affinal and indeed there is no common name for this. They usually occur in pairs but sometimes happen in groups of three or more.
[[File:royal-in-law-marriages.png|thumb|right|350px|In-law marriages in royal tree (click to enlarge)]]
||Relationship with Victoria's oldest cousin
File:Victoria_relations_to_Albert.png|Victoria's relations to her husband Albert
File:victoria-cousin-marriages.png|Cousin marriages involving Queen Victoria
The mod is installed in the normal way: unzip it; copy the files to the mods directory on your system, go to the mod manager, select it and press install. However it is strongly recommended that you do this first on a private computer with TNG set up on it because it can take some time to run the initial search, particularly if you have a large tree.
Below are some search results found in several trees. The first two were historic trees dating back at least 1,000 years and including many royalty and nobility. The third is a modern tree but still having a significant number of such relationships. The times are elapsed times on a standard Mac desktop. As you can see, the search time varies significantly not only with the size of the tree but also with the number of hits.