Please don’t underline postings it makes it hard to read. Yes your combined family income can count for a supervisa . You would submit your NOA which would show your total income earned last year which should include your rental income. NOA is the preferred proof of income earned for a supervisa. Your wife’s mother can’t care for your wife and children because that would be considered work. She can try to come to provide emotional support. If anything letters from a doctor highlighting pregnancy can often hurt an application so there isn’t a need to include it unless there are complications with the pregnancy. The exception is if there is a serious medical condition where someone is hospitalized, undergoing a major surgery (c-section would not be considered), someone is alone in Canada and facing a serious medical issue, death is a possibility, etc. If for example your wife was on strict bed rest and you had other children at home then that would be a reason to get a doctor’s note to explain that your wife has to be on strict bed rest with a toddler at home. Just a reminder that father’s are expected to care for their children as well in Canada and it is possible although difficult to care for children on your own even without a partner who is able to help during non-working hours. Even the doctor will tell you that women can take care of their babies without help especially with some support from a spouse as long as they take it easy. For example a husband would be expected to help cook and clean, lift anything heavier than the baby, etc. especially if a wife has a c-section. It would be nice if her mother can enjoy seeing her new grandchildren but I would focus more on coming to visit family versus need because of birth to eliminate any concern about illegal work. I would apply as soon as possible because TRVs can take multiple months to process. Would highlight that you MIL’s husband will remain at home to create a time to her home country plus state any other ties and include proof of her own funds although your income earned plus your own savings are more important for a supervisa.