I think its "Both his sons have gone abroad"
The plural form of the compound noun son-in-law is sons-in-law.example: Both of my sons-in-law are graduate students.
Yes, illigitimate children of British fathers born abroad to foreign mothers have no claim to British citizenship.
Battleme
Maybe. If the example you give is the entire sentence, then it is not correct: the verb should be plural to agree with the plural subject " two sons." But if the subject is "All that is left...." then the predicate "is two sons" is correct.
His sons were Domagaya and Taignoagny
Sons would be plural and son's is possessive. Tickyul
The correct plural form is sons-in-law.Example: My two sons-in-law help me with my yard work.
YesThe son and his sister = 1 son, 1 sisterThe sons and their sister = many sons, 1 sisterThe son and his sisters = 1 son, many sistersThe sons and their sisters = many sons, many sistersThough in reality this is a strange way to say it. More normal would be "The sons and daughters".
the correct pronunciation is "com-me-de-gas-sons
Yes. Cain and Abel were both Adam's sons (Genesis ch.4). Adam had other children as well, both sons and daughters (Genesis ch.5).
She killed both her sons (or often said to be three).
The possessive form of the plural noun sons-in-law is sons-in-law's.Example: Both of my sons-in-law's degrees are in the technology field.