Well the fact that it's your nephew wouldn't prevent you from claiming it. A direct relative like a sister or spouse would cause an issue. However to claim it your step-nephew would have to provide you with a receipt in addition you will need his social insurance number. He would then have to claim this as income on his tax return. Also if you paid for his services in your home, you may have additional responsibilities as an employer which you should contact CRA about. In most cases when you are paying a close acquaintance like this its assumed to be more of an under the table situation where they don't claim it as income and you don't claim it as well. Since if there are tax implications for the person providing the service they may have charged more.