The noun "familiar" is an enchanted creature, such as a witch's pet. It has the plural familiars.
The adjective familiar (known, recognized) would not have a plural.
You spell it like this F-A-M-I-L-I-E-S
The plural is bridges.
The plural of "turkey" is "turkeys."
The plural of address is addresses.
The plural form of him, her, or it is them. (objective pronouns)
These are: Mi (my), mío (mine), su (your), suyo (yours), tu (your - familiar), tuyo (yours - familiar), nuestro/a (our), vuestro (your - plural familiar), su (your plural), suyo (yours plural).
The plural is hooves.
The plural is cherries.
The plural is cantaloupes.
The plural is resources.
The plural is "emeralds."
The plural is roses.
The plural way to spell studio is studios.
You spell it like this F-A-M-I-L-I-E-S
The plural is bridges.
Trout is plural
The plural of beach is beaches.