Strong applause for a timely expose’ of a often unspoken topic.
In my career consultations many women think but do not speak about this. The few that do speak about this have concerns about asking a man — after all what does a man understand of the feelings a woman might maintain.

Please allow me to underscore ideas you share…
1) there is no need to mention condition or intention in any part of the interview;
2) it is important to gather data of several perspectives before bringing up your concerns to supervisor or HR, including:
current women employees
current women employees on leave
previous women employees with related experience
current women employees who have young or older family
3) bring the topic up with your supervisor first with your solutions in hand. Be aware: Timing may be critical — “meeting all of the needs of the various parties is a challenge to be met;”
4) prepare a thank you note referencing all the things you mention; and
5) then speak to HR.

The same factors may apply in similar circumstance for both men and women who need to care for older family members.