The case is that the officer just bends some of those legal reasons of denial if they just do not like your face. When you ask who made the new rule, they proudly say "I did"...
You will basically need documents to prove your marriage and being a parent to your son, and probably also a confirmation of marriage from your wife and an invitation to stay at your wife's house together with signed copies of her passport and ID-card.
Seems like they are pushing the rules to the edge. According to this, your own health insurance is no longer valid but you have to buy one from an approved list of companies even lesser coverage.