Do you have birth dates (or approximations) for either? The approximate location would also help narrow things down a bit. For instance, did these families originate in the Highlands or Lowlands? (probably Lowlands from the looks of the surnames, but you never know).

Katie, its a long shot but ask any of your senior relatives if they have any old paperwork or rare photos they may have hidden away an old birth or marriage certificate, they may have info on Thomas if he served in the forces truly its worth asking . Just don't give up researching, some days will be aaah! no info, then weeks, months later you will find a gem of information . regards and good luck researching .