I like [name_f]Leonor[/name_f] for you, because you could use [name_f]Nora[/name_f] as a nickname. You’d get to use 2 of your favourites in one go.
I think [name_f]Ada[/name_f] fits betters with [name_f]Leonor[/name_f] / [name_f]Nora[/name_f] stylistically than [name_f]Chloe[/name_f], but there’s no reason not to use [name_f]Chloe[/name_f] if you love it.
For a boy, I would definitely use [name_m]Aaron[/name_m], because ideally twins should have their own initial, so I wouldn’t use [name_m]Joshua[/name_m] and [name_m]Jasper[/name_m] together.
[name_m]Aaron[/name_m] and [name_m]Joshua[/name_m] are a better match than [name_m]Aaron[/name_m] and [name_m]Jasper[/name_m], but it would certainly be no issue to use either pairing.
For the middle names, I would absolutely choose one of the ''H" names, since there are 3 parent/grandparent H names, plus your own name. [name_m]Maret[/name_m] and [name_f]Martha[/name_f] are also very similar; so are [name_f]Emma[/name_f] and [name_f]Erna[/name_f].
So I’d probably choose:
[name_f]Leonor[/name_f] [name_f]Martha[/name_f] [name_f]Nora[/name_f] & [name_f]Ada[/name_f] [name_f]Christine[/name_f]
[name_f]Leonor[/name_f] [name_f]Martha[/name_f] [name_f]Nora[/name_f] & [name_f]Chloe[/name_f] [name_f]Julia[/name_f]
[name_m]Aaron[/name_m] [name_m]Hugh[/name_m] & [name_m]Joshua[/name_m] [name_m]Maret[/name_m]
[name_m]Aaron[/name_m] [name_m]Hugh[/name_m] & [name_m]Jasper[/name_m] [name_m]Harmon[/name_m]
[name_f]Leonor[/name_f] [name_f]Martha[/name_f] [name_f]Nora[/name_f] & [name_m]Aaron[/name_m] [name_m]Hugh[/name_m]
[name_f]Leonor[/name_f] [name_f]Martha[/name_f] [name_f]Nora[/name_f] & [name_m]Joshua[/name_m] [name_m]Harmon[/name_m]
[name_f]Leonor[/name_f] [name_f]Martha[/name_f] [name_f]Nora[/name_f] & [name_m]Jasper[/name_m] [name_m]Hugh[/name_m]