Ditransitive predicates [Syntax 2.1.1.1], as show for instance, take three arguments, in particular, a subject, a direct and an indirect object. In DGS, indirect object occurs before the direct object, thus the word order is S O(indirect) O(direct) V.
grandmother ix3b grandchild ix3a new necklace 3bshow3a
โThe grandmother shows the grandchild the new necklace.โ