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in my opinion you should not use a comma,
In general we put comma to separate between sentences, here the sentence has no meaning if you just say " I worked with the rest of the children", here is a link http://www.grammar-monster.com/lessons/which_that_who_comma_or_not.htm
findaway1) Do I need a comma before who?
Yes.
The group of children has already been defined as the ones who were not making snowballs. The clause is non-essential or non-defining, so it needs to be set off with a comma.