I can't speak for all millennials, but my DIL is CHEAP...a skinflint...Lincoln thumbs from pinching pennies...
My son does not want his wife to work...a neat trick since she was a Magna Cum Laude with a double major of psychology and criminology. He is a tradesman and making low six figures.
They have been told that they qualify for a $350K house...barely. The problem is they need at least three bedrooms and the only houses in that price range are either in a horrible (unsafe) neighborhood or in very bad shape. There are some homebuilders around who claim they have homes "starting in the $300s" but that turns out to be HIGH $300s and includes zero upgrades.
Homes in good neighborhoods that are in decent shape are $425K and up around here. New Mexico ranks 38th in cost of living, so it isn't like we are in California or Florida.
I recently had a family member pass away and we have to sell their 3/2 1700 SF condo. The location is okay, but it is very close to a main thoroughfare and it needs work. We are being offered $365K. Stupid money.
You are fortunate to have a frugal millenial in your family!