My Answer with regards to your Question:
In Singapore, unfortunately, your son cannot buy a Build-To-Order (BTO) flat with his grandmother at this time. Here's why:
Minimum Age: The minimum age requirement to apply for a BTO flat is 21 years old. Your son meets this requirement.
Family Nucleus: However, BTO flats are meant for immediate families like married couples, parents and unmarried children, or siblings. Grandparents are not considered part of the immediate family nucleus for BTO applications.
There are a couple of alternatives your son can consider depending on his situation:
Wait Until He Can Apply Alone: If your son is financially stable, he can wait until he turns 35 years old. At that point, he can apply for a BTO flat as a single applicant under the Single Singapore Citizen (Singles) Scheme.
As a single person in Singapore, you have two choices for HDB housing. You can either apply for a 2-room Flexi BTO (built-to-order) flat from HDB in a non-mature estate or buy a resale HDB flat. However, in both cases, you must wait till you are 35 years old (unless you are widowed or orphaned).
Wait till he is married
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