if I was partnering with my son, and I was providing the money/credit, I would be happy if my son took the initiative to (a) find the deals and (b) handle the day-to-day "business". (A) speaks for itself, but (b) may require explanation.
For my own properties I spend time each month looking at any bills being processed by the property manager. E.g. Today I saw a work order for a loose/rocking toilet. But a month or two ago there was a similar work order. And I vaguely remember a similar one maybe a year ago. What is going on? Is the contractor not actually fixing it? Is the tenant lobbying for a new toilet? I need to get to the bottom of that. Also, at the end of each month I go through the reports for each property and update my own accounting to make sure I understand revenue and expenses for each and that there were no mistakes.
One of my properties is a vacation rental and for that one I am the rental manager and deal with bookings, cleaning schedule, setting door codes, communicating with guests etc.
At the end of the year I do all the US and Canadian tax returns.
If my son was partnering with me, and I was providing the money/credit I would be happy if he took all of this off my hands and managed the business. Partly just to free up my time, but far more importantly because teaching him how to run a business would be the main objective. This is the perfect learning-on-the-job opportunity and it would give me great satisfaction to provide him the opportunity to gain that skill.
If your mother is similarly motivated, make her proud! And help make her some money!
Great question!
BTW! As it happens, my son took a finance degree and is smarter than his old man. He and a friend have a four-plex that they manage. I ask him questions now. Maybe he will hire me for a nice cushy retirement job some day. :-)