Unfortunately, subject to new practices, one property purchase permits only one CBI application in Turkey (no more split shareholding purchase value based applications). Therefore, you could purchase the property ($900k) for one spouse and then apply for citizenship for the purchasing applicant and also for the spouse and the children as dependents.
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What kind of real estate qualifies for citizenship-by-investment in Turkey?
Are there limitations regarding the type of property? Also, would I qualify for citizenship if the property is paid on a shared basis between me and my spouse? The total value of the property would be $900K and ownership would be equally divided among us. Does this make both of us eligible?