Not a tiny home, but the wife and I made the decision to merge households with her parents. In 2014, we had our own house, and were with her parents looking at apartments for them in Springfield MO, which is halfway between her brother & us. The problem was that, since my father-in-law teaches overseas for 7+ months of the year, he anticipated paying for an apartment that was going to be essentially empty.
My wife jokingly said, "You could just buy a house in our town and we could all live there. We'd 'house-sit for you then'. Well, one thing turned into another and now here we are. We cover the utilities, they the mortgage. We kept our house as a rental for a year before selling it.
Combining households has also allowed us to streamline our boys' homeschooling, as we now have four educators under our roof, and were able to aid our 15 year old on the fast track through dual credit coursework, leading to his entrance at university on a full ride this coming fall. While we're not the most minimalist of mustachians, we do work within the confines of what we're given. Though living with one's parents on a permanent basis-a multi-generational household, that is-may not be for all, or even many, it is something that challenges the status quo in a way that those here normally do not consider.
In short: Challenge every assumption-even 'familial independence'.