What would you do if you had neighbors like I have?

The house next door to me is inhabited by (yes) three men and a baby. The child will be 2 years old in January. The boy's mother previously had 4 children taken away from her by the state and she's out of the picture with this one as well. The father, I'm convinced, wanted the child (his only one, as far as I know) mainly for the welfare benefits. He occasionally works for cash under the table, but seems to spend what little cash he makes all on beer. The guy who's name is on the lease was injured in a motorcycling accident and collects disability benefits and pays the rent (doesn't drink), but relies on the dad to take care of the utilities. The dad (whom I refer to as "Beer-Before-Utilities") doesn't seem to pay a dime toward living expenses and assumes that his young son is his "ace in the hole," thinking that because he has a dependent, the state or some charitable organization will pick up the tab whenever he needs help. This help is often slow in coming, since the economy in Michigan is horrible these days and the tax base is ever shrinking. Since the spring, they've been without gas for a time, have had their water shut off twice and now have neither water or electricity. I want to call Social Services for the child's sake, but I'm afraid the city would then be forced to condemn the house and leave the non-drinker homeless. He's a good honest guy who's just made some bad decisions. I could care less, though, about Beer-Before-Utilities. The child is still young enough that there must be a nice couple somewhere out there willing to adopt him. My guess is that the state will eventually take the child from his custody anyway--but who knows when? How could I help the child without causing further problems for the disabled adult?