Ok so here is my situation...
I have a husband and wife, and the husbands best friend, and the Best friends child living in the home. The husband and wife have the Get all 8 islands LTW. The best friend has the diving LTW and the child doesn't have a LTW. So can I have all three adult sims do different tasks to get all eight islands. For example, having the wife be the diver, the best friend the life guard, and the husband do extra things, like the Opp. Will it all count to be successful in reaching the LTW to getting all 8 islands. SO another words, when others find them does it count as the whole family finding the island and therefore completing the LTW wish of the hubby and wife quicker?