HI,
I am in similar situation. I had entered wrong date of birth for my spouse's father in my EE application. She was a non accompanying spouse in my EE application. Later on, I added my newborn in the application when the application was in progress. I had to resubmit IMM 0008 and IMM 4506 forms. There, I have entered correct DOB of spouse's parent. My application got processed and I am now a PR. I was going through my files and came to know about this glitch as I am now sponsoring my spouse for her PR. Will that affect her application? Which date will the VO refers to - the one in my EE application or the ones which I'll submit now?
Can you please give your inputs.
Use the correct date. If you are concerned, add a letter of explanation that there was an unintentional mistake in previous form.
No guarantees, but your spouse's father's date of birth is NOT a critical piece of information (in that does not directly have much to do with eligibility or the level of scrutiny your application would give - IRCC does not really care that your spouse's father was 57 or 59 years old, for example). This info is for identification and background check purposes and no direct bearing. [Now there MAY be some rare circumstances where it would matter, but very rare, I would think]
They are not searching to punish applicants for inadvertent errors, and this is not a substantive one. Just own up to the mistake and tell the truth. So hopefully there is little chance of any issue.
[Ritual emphasis to all applicants to check carefully - errors and typos do happen, but other ones may be substantive, and many errors will reduce credibility of the applicant and sponsor. Substantive errors could lead to problems.]