These are "rare sugars" found in tiny amounts in nature.
The phrase "sucres cousin" could literally translate to "sugar's cousin," which might imply a related substance or a similar product. There are several substances that could be considered cousins or related to sugar in various contexts:
If you meant a different cousin — such as (Splenda), maltodextrin , or even lactose (milk sugar) — just ask! The sugar family is large, and I’m happy to introduce you to more relatives.