Hi ClanNisbet,
Had a look at Wills on Scotlandpeoples website, there are 2 entries from Musselburgh
" Nisbet, Robert - 22/10/1833, Builder in Musselburgh, Inventory, Edinburgh Sheriff Court Inventories
SC70/1/49" could be the one you are looking for.
" Nisbet, Robert -21/12/1810, Road Surveyor & Mason in Milhill of Musselburgh,
Inventory ; Disposition ; Settlement, Edinburgh Sheriff Court Inventories SC70/1/3"
Could this be the father?
Looking at the Wills could give more info.
Tom Buchanan