In today's practice, residence permits based on property purchase are no longer allowing dependent applications (spouse or minor children) unless they are also listed as co-owners. At the moment the applications are accepted for one property for one permit basis (thus co-owners may enjoy as part of a family). However, this is not permitted for adult children. The property value was also not a concern in the past, however, today, a minimum $75k to $100k (depending on the district) proven with an independent appraisal report is also sought. As for the adult dependent you mentioned, unfortunately, such is also not permitted. The same rejection of adult dependent (even with disability) is applicable for citizenship by investment option ($400k + property investment) however, at CBI, the spouse and minor children (children under 18) could be made dependents without becoming co-owners.
