Summersoon, um, what do I say? If I had a bit more support and a greater number of options, I wouldn't be in this position. As it explains earlier in the thread. And the related threads.
WRT being charming, after 22 years of biting my tongue in relation to childcare grief, occasionally my halo slips. I am human. I am offering you my moccasins so you can walk a mile in them, as then things might become clearer.
WRT leave, you can't suddenly take unpaid mid-semester leave when you're a lecturer, because we're all specialists and it means the students don't get taught, which isn't permissible.
WRT aunts, I have one who is 73, childless, and lives in Bristol (i.e. ten hour round trip in the car), so that's about as much use as a chocolate teapot, as is my SIL in Istanbul (also childless btw).
Honestly, if I had a quid for every time someone said naively "Why don't you just leave them with a relative?" I'd be a squillionaire. Do people think I am stoopid?
Sorry, Summersoon, you are pressing my buttons a bit.