A child who is unrelated to the person who provides support may be able to claim a dependency exemption if the child is a qualifying relative. Even though there are no blood ties, a qualifying relative includes a child of another taxpayer as long as that other taxpayer is not required to file a tax return (or does so only to obtain a refund). But check all the tests for a dependency exemption (support, gross income, etc.).
Depreciable property used in a trade or business and held for more than a year. All Section 1231 gains and losses are netted; a net gain is treated as capital gain, a net loss as an ordinary loss.