Blog Blog Blog, it's a dogs life...

...well someone's got to do it!

Someone's is correct. It is a possessive case. also. It is always singular in form, even though it may refert to a group of individuals.

As to the spelling, it is a kind of compound word, so the 'e' stays as it would if the words were separated, like some one's.

Is that any more clear?

whats the difference between someones and someone's ?

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Pronounciation and possessive ownership of!

A picture would fill the gap