Penalty for late addition of more details.
Firstly though, why would you want to get a few dollars if that means stopping your parents from getting back thousands? You live together and presumably you want this to be a happy arrangement, right?
Now, you mentioned a boyfriend. Covered by a completely different set of rules.
You don't say if the boyfriend lives with you at your parents' home. If he does NOT live with you, then he can't claim the child as a dependent because to do so, the child has to live with him in his home. Also, if he lives with his parents, then he may be able to be claimed by them as a dependent which would also block him from claiming a dependent of his own.
However, if the boyfriend lives with you in your parents' home, then it is much harder for your parents to claim him as a dependent than to claim you. To claim your boyfriend as a dependent, he must live in your parents' home for the ENTIRE year, and he must earn less than $4050 in taxable income. If he can be claimed as a dependent, then he can't claim a dependent. But if he can't be claimed as a dependent of your parents, but he lives in their home with you and child, then he could claim your child as a dependent (assuming born before 12/31 of course).
Now, the fact remains that unless he has more than about $10,000 of income, he would get less for your child than your parents will, so why mess that up? But if your boyfriend does work, and lives with you, and can't be claimed as a dependent by his parents or yours, then he can claim the child if it is born this year.