Within the context of a discussion of your son’s appetite , the first sentence needs “the” before the word “most”. If, instead, the discussion were about where your son eats his meals, the words “most in” should be “mostly with”. The second sentence (I assume ‘amonf’ is a typo and should read ‘among’): Then, the two interpretations would be the same… If about appetite, insert “the” before “most”.
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lucas21c1. My son eats the most in my family.2. Of all my friends Tom eats the mostYou need the article "the" because the noun "food" is implied. "the most food" ~ "the greatest amount of food". If you say "most", it. amonf all my friends.
lucas21c1. Then "My son eats the most food in my family" is also okay?Yes, that's OK.
lucas21c2. The reason why you move "of all my friends" to the very front of the sentence is that the connection between"the most" and "of all my friends" is not good and may cause misunderstaings, right?No, not really. The reason is that
lucas21cI forgot to ask one thing. Could you tell me which one is right between "My son eats as much as me in my family" or "My son eats as much food as me in my family"?Both are good.