I learned these as the the "Ein Words" because they mostly follow the same rules as "Ein" (Or more closely to "Kein")
mein = my ... dein = your ... sein = his ... ihr = her ... sein = its
unser = our ... euer = your (plural) ... ihr = their ... Ihr = Your (Proper)
Put an "e" at the end of any of them to signify a plural noun that follows them OR a feminine noun that follows them (just like the word kein). "euer" becomes "eure" when adding the "e" at the end of it.
Someone correct me if I have something wrong, please.