Will I lose my eligibility as an EB-5 dependent if I get married?

If you are already a conditional permanent resident, then marriage does not destroy eligibility for a full green card.

I do not believe that is the correct answer but would need to research. I think you may only need to file your own I-829 in that situation with a separate fee.

Derivatives are defined as unmarried children under 21 for the initial filing of the adjustment of status or immigrant visa processing. If your parent has already filed the i-829 to remove the conditional permanent resident, you are no longer subject to the age or marriage requirements since you are already permanent residents.

You should not get married until your I-829 is approved. As a dependent, your wife cannot obtain her own permanent residency through the same EB-5 you are currently pursuing permanent residency. This is simply because dependent children are supposed to be under 21 and unmarried. Thus, you should wait until your I-829 is approved and then, subsequently marry, file an I-130 petition for your wife and if approved, then finally file I-485 for your wife. Advisably, consult an attorney on these procedures to ensure proper processing.

I believe that may be correct.