parent doctype is Parent
child doctype is Family
compute the age ,
field name is age
table name is Family
how about in child table?
logic is same; now we have to made a script the for child table.
Fully reference provided and also said that minor changes needed. Now, you need to develop it according to your specific scenario. This platform is not intended for developing the entire script or providing every detail. 
I think you should learn about client scripts then please check it post: Client Side scripting - #2 by NCP
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thank you
