This is a tricky one. I would suggest you consult an immigration lawyer.
Canada says that if a dependent child is being sponsored, then that child's spouse cannot be found medically inadmissible for excessive demand.
For the record, someone with a spouse is by definition
not a dependent child.
Here is what
section 38 of the
Immigration and Refugee Protection Act (IRPA) says:
38 (1) A foreign national is inadmissible on health grounds if their health condition
(a) is likely to be a danger to public health;
(b) is likely to be a danger to public safety; or
(c) might reasonably be expected to cause excessive demand on health or social services.
Exception
(2) Paragraph (1)(c) does not apply in the case of a foreign national who
(a) has been determined to be a member of the family class and to be the spouse, common-law partner or child of a sponsor within the meaning of the regulations;
(b) has applied for a permanent resident visa as a Convention refugee or a person in similar circumstances;
(c) is a protected person; or
(d) is, where prescribed by the regulations, the spouse, common-law partner, child or other family member of a foreign national referred to in any of paragraphs (a) to (c).
We can see that A38(1)(c) establishing inadmissibility on the grounds of excessive demand does not apply to the sponsor's child, per A38(2)(a), and A38(2)(d) seems to extend this to the spouse of a person referred to in paragraph (a), as prescribed by the regulations. So, we turn to
section 24 of the
Immigration and Refugee Protection Regulations (IRPR):
24 (1) The exception set out in paragraph 38(2)(a) of the Act does not apply to a child who is not a dependent child of the sponsor.
Prescribed family members
(2) The following family members of a foreign national referred to in paragraph 38(2)(a) of the Act are prescribed for the purpose of paragraph 38(2)(d) of the Act:
(a) the dependent child of the sponsor’s spouse or common-law partner;
(b) the dependent child of the dependent child referred to in paragraph (a); and
(c) the dependent child of the sponsor’s dependent child.
Exception
(3) Paragraph 38(1)(c) of the Act does not apply to a foreign national who is a member of the family class and is
(a) the conjugal partner of a sponsor;
(b) the dependent child of the conjugal partner referred to in paragraph (a);
(c) the dependent child of the dependent child referred to in paragraph (b); or
(d) a person referred to in paragraph 117(1)(g).
Now, we see that R24(1) in fact excludes a non-dependent child (such as you) from the meaning of child under A38(2)(a), and furthermore, the only prescribed family members "for the purpose of paragraph 38(2)(d)" are dependent children.
Unfortunately, this would seem to mean neither you nor your spouse are exempt from being deemed inadmissible on the grounds of excessive demand. But again, I am not an expert, so the advice to consult an immigration lawyer holds. Good luck!