Daddy
Would suggest you have a decent look at previous posts as they cover this...and the Japanese mentality does not change.
You are there to serve the company, your family concerns are pleasant but inconsequential.
You are there to complete THEIR requiements, your desires/needs are inconsequential.
Your want/need to confront them about a family issue is the start of the slippery slope of being "unsuitable"...if the slippery slope hasn't already been started for any number of reasons during training to date.
Worked in Japan for another operator but believe the mentality is consistent, happy to be corrected if all of a sudden happy/cuddly/fluffy has become a thing in corporate Japan.
And straight onto the 787? Interesting delusion I would have thought.
Cheers.