All I can say is, Penny Wilson, told us on another thread that GD George's ancestors live on the west coast of the USA.
And, if the children proved to be no threat to the other Romanovs, which evidently they did not, AND, if they did not live near any of the other Romanovs, then there was no contact.
It's call "live and let live".
If there was any contact, it was through what our family called, "by the back door". There was no fuss, no bother, and they left.
Simple. Quiet. And that was it.
Unless you lived in that society, it's difficult to understand this attitude and the lack of information. But, when the Royal family wanted a secret kept, it was kept, or a person paid the consequences of "letting the cat out of the bag".
AGRBear