No, you cannot claim your boyfriend's child.
One of the qualifications for claiming your boyfriend's child is that the child must have lived with your for the entire 2016 year.
You can claim your boyfriend's child, (as qualifying relative) if:
- No other taxpayer can claim them as dependents (qualifying children),
- They lived for the
entire year with you, and
- You paid more than
half for their support.
Below link provides more information on dependency rules:
https://turbotax.intuit.com/tax-tools/tax-tips/Family/Rules-for-Claiming-a-Dependent-on-Your-Tax-Ret...
