The homeownership rate has been remarkably stable at around 65% for the last 50 years. It generally stays within 2-3% of that number, even though it does have periodic, temporary upward and downward trends.

I wouldn't call it an actual trend unless it falls outside the typical range and stays there for more than a few years.

Can we measure % of homes transferred from parents to children? I know several millennials who inherited their houses from their parents when they passed away. There is no way they would be home owners otherwise.