My sister is using Ancestry for our family tree and we have several thousands of people on our tree. As it is online we don't put the names of living people on the tree.
I did most of the research on our Tasmanian side (my Dad's fmily) years ago, and in the last few years my sister has researched my mother's side (New South Wales, Queensland). We go back to the Second Fleet in Australia (1790), and we have been able to trace some branches back further in Britain (some back to the mid 1600s)
My sister and I split the cost of the paid subscription at Ancestry. It works well for us and we have managed to use it to contact many other people who are researching the same families as we are.