I know that both "more" and "else" can be used in the meaning of "besides". Well, at least I think so. Here are examples:
- I have told you all I know. What else do you want with me?
- I have told you all I know. What more do you want with me?
As far as I am aware, the later is less common but carries the same meaning as the former sentence.
For this not to sound like a duplicate, here's the main question: Can "else" and "more' work in an identical way in the following sentences with the words "anything, something, whatever, whenever, wherever, whomever, whoever, someone, somebody, and everything"?
- I've already helped your mom and sister. Is there anyone more you want me to help?
- That's it. I can't help him. There's nothing more I can do!
Edit: It's not a duplicate. I'm not asking about the difference between "what else" and "what more". I'm asking about using "else" and "more" with words "anything, something, whatever, whenever, wherever, whomever, whoever, someone, somebody, and everything".
Best Answer
For the first couple of sentences, refer to the suggested other question...
Referring to the rest of the questions:
In the first case, "more" is incorrect (although it would be understood). Your mom and sister are different entities.
But it could be used in a slightly different phrasing, if the family is thought of as group of people:
In the second case, "more" is correct, suggesting that you did some things to help but you can't do more things (nothing more).
In this case "else" would be correct if specific actions were listed:
But "more" would also be correct, as it suggests "more help".