Question: What are the legal obligations of a guardian? Can one be a temporary guardian? 

Answer: I would say the obligations of a guardian are the same as a parent.  Safeguard the child and provide for their basic needs.  I'd imagine that temporary guardians are possible, if say, a single parent is put in jail for something like tax evasion for a couple months.  A temporary guardian, probably someone in the immediate family, would be named guardian for that time.
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