Yup, from HDB sales application FAQ:
Q5: How are the married child’s and parents’ applications balloted under the Multi-Generation Priority Scheme (MGPS)?
A5: Each MGPS application will be issued three queue numbers, one under the MGPS and two under the Public Scheme. Under the MGPS, parents and married children will receive one queue number for their combined application. Under the Public Scheme, separate queue numbers will be given to the parents and married children, as determined by their respective household status. Depending on the shortlisting results, applicants can decide whether to book under MGPS or as a public applicant.
Will it happen to be, say combined Q# is 5, and the public Q# is 1000?
Or it is confirm that the Q# will be very close for both Q#?
hope you can your desired unit too