Great find!
I would assume that with all the press about her and the lawsuit, Lilian is enough of a public figure to talk about here, right? She might not be notable enough to have a public profile, though.
It looks like Lilian was traveling a lot, e.g. 1933 and 1936. One of those also has the birth date of the father, to have that one a little bit more confidently sourced.
The mother apparently was from Sprendlingen in Germany.
Birth of Ernest:
https://a860-historicalvitalrecords.nyc.gov/view/1665182