When you create a tree you can choose to include contact information for living relatives and invite them to be a part of your tree, for them to view it and add to it. There is a family calendar, timeline, and news features that can be used with your tree. Within your family group you can highlight changes made to the tree, to spotlight research you all have been doing.
If you do a search through the website you can find other family trees that may include your relatives. You can use this to find more distant living relatives. You can then contact them and share information and even join each others family tree group.