Abstract: A combined adult and children's toilet seat assembly (21) having a seat mounting structure (22), a toilet seat lid (51) and an adult toilet seat (31) pivotally mounted to the mounting structure (22) for pivotal movement about a first axis (28). A children's toilet seat (33) is pivotally mounted for movement about a second axis (44) forwardly of the first axis (28). Pivoting of the child's seat (33) from an axis forwardly of pivotal mounting of the lid (51) enables the child's seat (33) to be lifted to a position in which it is tilted rearwardly by a greater amount than the lid (51) so as to positively nest and be gravity biased into the lid (51). The child's toilet seat (33) is further releasably mounted to the assembly by resilient grippers (46).