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Only members of her family were invited to the wedding.

That is a sentence without a context. I wonder how many members were invited.

All of them? Some of them?

Would you please tell me about it?
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norwolfI wonder how many members were invited.
The sentence doesn't tell you that information. It has nothing to do with the number of people who were invited or not invited.
norwolfAll of them?
That is possible, theoretically, but not likely.
norwolfSome of them?
Yes. Some of them certainly were invited.
_________

Because of the word "only", the sentence tells you more about who was not invited.

All people who were not members of her family were not invited to the wedding.

That is, for all people in the world, if you were not a member of her family, you were not invited.

CJ
Comments  
Students: Are you brave enough to let our tutors analyse your pronunciation?
Many thanks, Jim. You perfectly analysed it in detail.
In order to make it clear, we say:

All the members of her family were invited to the wedding.

All members of her family were invited to the wedding.

The members of her family were invited to the wedding.(all of them)

Some members of her family were invited to the wedding.

Some of the members of her family were invited to the wedding.(some of them)

Right?

norwolfIn order to make it clear, we say
It? What's "it"? I assume you're talking about making the original statement clear. But there is no need for that.

The original statement is completely clear, and has a shade of meaning all its own, which centers on the idea that certain people were not invited. This shade of meaning is communicated by using a phrasing with "only".

All of your statements with "all" and "some" are correct and can be said, and those with "some" are logical equivalents of the original, but none of them expresses the exact meaning of the original statement and its message of the exclusion of certain people from the wedding.

CJ
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Oh, great. Something special is never replaced.

Thank you again, Jim.