I was wondering if you could contact nephews directly?
You're a relative in your own right and you can have your own interests/invitations
for them. She doesn't own the family.
As my Nmother got older, if someone was coming to town,
I'd usually send them a message, suggesting that as she
did need to rest more than in years before...I thought on X day
we (me and the visitor) would do ___ (outing, activity, whatever).
I wouldn't even mention it to her because otherwise she'd start
taking over every second, planning wise. As an adult woman I had a
right to experience my own relatives. When the time came I wouldn't
ask her, I'd kindly TELL her: So-and-so and I are going to ___ and we
will be back at X o'clock.
Premature advice and you didn't ask for any.
love
Hops