This noun follows the standard English plural rule: simply add -s to the singular form.
Step-grandfather is regular. It follows the Standard -s rule.
Use plural verbs: "The step-grandfathers are ready" (not "is ready").
Yes. The plural step-grandfathers is standard across all English variants.
The word step-grandfather follows the standard English pluralization rule. When forming the plural, step-grandfather becomes step-grandfathers. This follows the Standard -s pattern, which is one of the most common plural rules in English.
Understanding why step-grandfather becomes step-grandfathers helps with spelling and pronunciation. This noun follows the standard English plural rule: simply add -s to the singular form.
When using step-grandfathers in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The step-grandfathers are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.