Possible Clues:

• Two who are relatively close to craftsman
• Master builder of historical and detective novels
• Parent and child might make a 26 down for you
• How parent and child together work with stone
• Builder employing parent and child
• How parent and child contribute to the build-up
• Stone-carvers Mother and Child
• Parent and child are together in the building business
• A worker in stone, may be free
• Street director?