No. EB-5 derivative status reaches your spouse and unmarried children under twenty-one, not a sibling, regardless of who co-owned the house or contributed proceeds. Your sibling's role in this file is evidentiary — proving the allocation and the transfer — not a claim to a visa.
Who is actually covered, and what ages mean
Co-ownership and family eligibility answer different questions. The sibling may provide a sale instruction, estate allocation or genuine gift record without becoming a derivative applicant. If the sibling independently seeks immigration, that requires a separate qualifying route; sharing one property’s proceeds does not create a combined EB-5 petition or permit the same capital to be counted twice.
Under the Child Status Protection Act, the time an immigrant petition spends pending is subtracted from the child's age when a visa becomes available, and the child must then seek to acquire the visa within a year. Immigrant-visa admission or adjustment approval yields two-year conditional residence, and Form I-829 must be filed within the 90-day period immediately preceding the second anniversary; a spouse and unmarried children under 21 may qualify as derivatives. A child close to 21 needs the Child Status Protection Act calculation done properly, because filing a petition does not simply freeze a child's age, and a child who ages out has to be planned for separately.