> > Thule: > [...] > > 03. same age sibling, child of same mother > > Wouldn't that necessarily be a "twin"? Do you mean identical? or fraternal? Thule don't birth identical twins. They occassionally birth fraternal twins, but usually they birth in litters of 3 to 5. I'd not considered it, but I suppose they might have a special term for a single child born with no litter mates.