Apologies for not looking further.
[h=5]143.212[/h](1) The applicant is:
(a) sponsored in accordance with subclause (2) or (3); or
(b) taken, under subclause (4), to be sponsored in accordance with this clause.
(2) If the child has turned 18, the applicant is sponsored by:
(a) the child; or
(b) the child's cohabiting spouse or de facto partner, if that spouse or de facto partner:
(i) has turned 18; and
(ii) is:
(A) a settled Australian citizen; or
(B) a settled Australian permanent resident; or
© a settled eligible New Zealand citizen.
This is the regulation. Yes the spouse - son in law can sponsor you