A tourist visa has completely different requirements and criteria.
neither has anything to do with the officer conducting an interview.
I had quite a few tourists visa interviews and all required documentation - letter from the company I worked for, salary, number of vacation days, financial statements, proof of ownership (I provided car, home)… i uploaded everything ahead of time and brought the originals to the interview. I had my planned vacation agenda as well.
every time before the interview started I was asked if I preferred the interview in English or my native language. In case assistance is needed, they have native speakers working and assisting the officer. Assistance was always offered.
I witnessed a few instances where a brother got approved and sister wasn’t even though they provided the same documents, travelled together too. Tourist visa is issued on individual circumstances and documents provided. There are also countries that made that process more difficult because of visa abuse.
you are grasping at straws.
your MIL should not be helping your wife with the baby. That’s considered working.