How to find the parent child in data sources

Hi

I have all the parts fetched with the Query-object webject (Wt.Part.PartusageLink), with MODE= NESTED

I use a for loop in java, to loop through the elements to perform some calcualtions, if the parts are parent and child

By parent child i mean if part2 comes under part1 bill of material, ill apply the calcualtions on these 2 components.

Now how can we find the parent and child relationtionship using Info*Engine, on these 2 parts?

Thanks in advance

Best regards

Maha