If you are in a rental townhouse I would make th elandlord aware of the issue. He may be able to deal with it on your behalf. If you own the townhouse it becomes difficult to deal with depending on the mentality of the people. If you and your hubby went over in the evening and just very nicely explained that you have a daycare and that you dont want to stop them from using the area but that would they please be more mindful of their language when you are out with the kids. The smoking may be a more sensitive subject but you could always ask. If this is a public area, are they disposing of their butts appropriately or just tossing them in the grass? that would be a concern as well if you have little ones. Not sure how the the public areas of a townhouse complex works but if there is a property manager of something of the sort that could help out with regards to the smoking. tough spot to be in but best to be as sweet as possible first. good luck