He seems to be alone again in 1940, living with his daughter Olive Freese and her family in Beverly Hills. Well, that would tie in with Grace being an actress

and she might not have been with Thomas in that census because she was away working in the movies

I now see that Thomas and Grace were nextdoor neighbours in 1930; I didn't make the connection before Willsy found the marriage.
One thing that bothers me is that Thomas, on more than one occasion, gives his mother's birthplace as Northern Ireland, but as he was 8 years old when his mother died he may have been genuinely uncertain about her.
All the other evidence supports it being one person with a timeline running from England to Australia, New Zealand, and California. The early life in England together with the fact that his sister clearly believed this to be her brother is also supportive. Yet there is still a lingering doubt . . .

I'm pinning my hopes on the Marriage Cert at the moment . . . but NSW Registry is very slow

And I suppose there might be a mention in the father's will . . . when that eventually turns up

But is past my bedtime now so I'll leave the rest for another day.
Mike.