When Zenith hears that Paul has died, she will begin to mourn.
And, most likely, cry.
However, between Lilia, Zenith, and I, we can at least share the grief three-ways.
"Mother…"
It seems like now is not the best time to say it.
When she is able to take it easy and understand the present situation a bit better.
It'll be fine after that.
It's best to take things slowly and sequentially.
I don't think it would be wise at all to push the harsh reality on her so suddenly.
First, meeting Zenith after all this time, shouldn't it be a pleasant thing?