system
Given the following post, respond as if you're commenting on Reddit:
human
Advice on how to handle a strange situation regarding my MS thesis publication status to my PI in the first week of my PhD

Hi. 

As everyone knows publications are a big deal and expectation at the PhD level. My masters thesis was on a niche topic, and I had some pretty nice results. One of the main reasons I was selected for this PhD was due to my thesis topic, which I plan to expand on in my doctoral program . My current pi is really wanting me to be working on getting this published. The problem is, MS thesis advisor is on a leave of absence due to her very young child’s severe health issues ( which she just informed me of) 

How do I address this with my pi?I don’t want to just give away her personal life issues, but at the same time i think he is judging me as I have not met with her yet.
gpt
Tell your new PI that your old PI is on a leave of absence and ask your current PI for advice on how to proceed. If your PI prods, say that you don't have more info to provide about the leave of absence.

Basically, be honest without the extra details, and use it as an opportunity to ask for your PI's advice.