Tablet is for two family members and one of the chisellers
I believe the answer is:
stonemason
'tablet is for two' is the definition.
I can't judge whether this definition defines the answer.
'family members and one of the chisellers' is the wordplay.
'family members' becomes 'ma son' (ma and son, mother and son).
'and' says to put letters next to each other.
'one of the chisellers' becomes 'stone' (I can't justify this - if you can you should give a lot more credence to this answer).
'mason' after 'stone' is 'STONEMASON'.
Can you help me to learn more?
(Other definitions for stonemason that I've seen before include "Person skilled in preparing rock for building etc" , "Architectural carver" , "Construction worker" , "Building worker" , "Rock craftsman" .)