"230 ml Olive-Oil and 110 ml of Lemon juice. Following morning he went to toilet at 7:20 AM. We observed stool at just later part was"
I have no idea what sort of receipe you used but the only thing I can tell you is that this amount of oil would be very hard even for an adult person.
So, 60 to 80 ml olive oil I would consider appropriate for a five year old.
Furthermore, before undertaking a Liver Flush a very good preparation should preceed. I would imagine that the boy has other complaints beside this gall stone, for instance constipation or diarrhea.
As a rule the pipes (bowl and kidney) should be cleaned first. Then the diet should be improved. This makes sense because gall stones have a certain reason why they are formed.
To get a stone out of the gall bladder repeated flushes are necessary (at least five).
Furthermore, sometimes is is possible disovling gall stones by oral application of ursocholic acid. This compound increases the proportion of bile acids in the bile thus sometimes dissolves gall stones - however not all types of stones.