Yes if you will mean that uncles posses something.
Examples:
uncles' houses (the houses of uncles)
uncles' children (the children of uncles)
No, "uncles" does not have an apostrophe. An apostrophe is used to indicate possession or to form contractions, but in the case of "uncles," it is simply a plural noun.
If you are talking about the friend of one of your uncles, then yes: I spoke to Tom, who is my uncle's friend.
The possessive of all English plural nouns ending in s is formed by adding an apostrophe: uncles'.
Cousin. Your parents brothers and sisters are aunts and uncles. and the aunt and uncles children are your cousins.
Chiron, Bythos, Aphros would be uncles by Kronos and Philyra; by Kronos and Rhea her uncles are Poseidon and Hades, both brothers of Zeus are her uncles; on her mother's side she did not have uncles.
uncles
your uncles daughter would be your cousin
he had 3 uncles
Your aunts and uncles are the sisters and brothers of your parents.
Your uncles daughter would be your cousin.
Charles Uncles died in 1933.
your uncles daughter would be your cousin
A possessive noun is a noun that shows that something belongs to that noun. The standard method of showing possession is to add an apostrophe 's' to the end of the noun or, for some nouns that already ends with an 's', to add an apostrophe after the 's'. Examples:The woman's coatThe children's poolMy uncles' namesGeorge Washington's wifeCape Cod's beachThe boys' locker