in my country real estate is not something that is so common,so was asking about the about the degree with the view that it would perhaps get me in track for real estate business.

Cash flow is where businesses really shine.

A formal business built on this seems overkill as you’re essentially paying someone for a service that already has standard model.If you and the parnter have distinct business tasks/abilities (i.e. not what you would hire an agent or contractor for), such as off-market lead generation, that’s a different discussion.

Try and join a few local Facebook pages and connect with locals who are in the house hacking business. 

Quote from @Gianma Vanzo: My wife and I are HI W2 and business owners.

How about using SDIRAs not to hold assets but to operate businesses?

@Andreas Mathews admirable, but make sure you do some research so you understand what a PM can make.Starting your own PMC business will require 75-150 doors to make a decent living, depending on gross rents and your fee structre.Working for a SFR PMC as a PM, will require a RE license and you usually get paid a percentage of the gross rents the portfolio of owners/properties you manage generates.

Also be aware of Unrelated Business Income Tax (or UBIT) on leveraged real estate inside of an IRA.Or better yet, since you are self-employed - go with a truly self-directed Solo 401k plan, which would be a much better option and will help you avoid the UBIT on this investment.

Start with small goals, and soon enough, you'll find yourself turning away business.

Your taxes are none of the ex wife's business and this would seem to address your concerns.I would also put her on notice that future requests for financial discovery will be two-way and if a discrepancy is seen in the other direction you will seek support from her.