I've never had to deal with one, but my almost 21-year old nephew who is living with me temporarily
The downsides:
What makes you think it will be temporary? what is he doing that would enable him to take care of himself? Why isn't he back at his parents and instead on your doorstep.
Good luck
What makes you think it isn't temporary? -- What we're saying today is that you're either part of the solution or you're part of the problem. - E. Cleaver 1968
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