Other juvenile siblings may also help out. This also gives juveniles the necessary parenting practice. Tamarins which are removed from their group when they are too young later become poor parents. Adults share food with the young, offering the food to them or tolerating playful stealing by the youngsters. Babies ride on the backs of adults until they are about 6-7 weeks old.
Many offspring remain with their parents to form extended families.
Golden Lion Tamarins are territorial and rarely travel far from their nesthole. When rival groups meet, they engage in a ritual of scolding and scent marking. They rarely fight. But in captivity, adults of the same gender kept together may fight to the death. Unlike other primates, females leave the natal group first and are often aggressively chased out by the resident female.