: The person we list as being x in line to the throne may in fact be x+1, x-1 or not in line at all.  Our assumption is that we have complete information about all births, marriages, deaths and religious conversions and know how the laws should be applied, but that is WP:SYN:  "Do not combine material from multiple sources to reach or imply a conclusion not explicitly stated by any of the sources."  It is fine to say that a person is x in line to the throne, if a reliable source says that.  It is not fine to combine that information with other information to revise the list.