Well one of each of them really.

His Wife Tesseral, a Fire Elf of a predominant Desert world. While they lack the standard resistance to Magic and ability to use magic to the wood elves of his world, they have Resistance to Fire and fight high-temperature fatigue very easily.

Roberts Daughter, while she takes after her father for some reason, she is just as resistant as her mother to Fire and Heat Fatigue... but she seems to be unaware of the meaning behind things in her family's household.