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No need to take amoxicillin.
Hello dear, welcome to Ask a doctor service.
I read your query and here is my advice.
First of all I don't understand why the doctor prescribed amoxicillin to a person who is currently taking penicillin.
Both penicillin and amoxicillin are antibiotics of the class b-lactam antibiotics.
They are both sensitive to the same group of bacteria, staphylococcus and streptococcus.
So I think that there is no need to start taking amoxicillin while in penicillin and for more no need to stop penicillin.
So you son can continue to take penicillin and don't take amoxicillin at all.
Hope I have answered the question.
Let me know if I can assist you further.