[name_u]Miles[/name_u] [name_u]Elliott[/name_u] is very handsome 
You have a lovely list of contenders from your list for brother for [name_u]Miles[/name_u] I really like [name_u]Sonny[/name_u] & [name_u]Wyatt[/name_u]. I absolutely love [name_u]Sonny[/name_u] [name_u]Adrian[/name_u] I think that name is gorgeous.
You’ve had a few suggestions so count any repeats as me being in agreement with the berries
[name_u]Miles[/name_u] [name_u]Elliott[/name_u] and…
[name_m]Oscar[/name_m] [name_u]Wyatt[/name_u]
[name_u]Jasper[/name_u] [name_u]Wyatt[/name_u]
[name_m]Samuel[/name_m] [name_u]Wyatt[/name_u]
[name_m]Zachary[/name_m] [name_u]Wyatt[/name_u]
[name_m]Cormac[/name_m] [name_u]Wyatt[/name_u]
[name_m]Hugo[/name_m] [name_u]Adrian[/name_u]
[name_u]Gabriel[/name_u] [name_u]Adrian[/name_u]
[name_u]Jonah[/name_u] [name_u]Adrian[/name_u]
[name_u]Micah[/name_u] [name_u]Adrian[/name_u]
I really like the idea of [name_u]Wyatt[/name_u] in the middle name slot because like [name_u]Miles[/name_u] middle name [name_u]Elliott[/name_u] they share the double T that could be a sweet subtle connection.
From your girls I really love [name_f]Audrey[/name_f], [name_f]Carys[/name_f] & [name_f]Joanna[/name_f]. I really like with such an overtly masculine name a more feminine leading sister name which makes me not as keen as [name_u]Romy[/name_u] & [name_u]Winter[/name_u] for first names for [name_u]Miles[/name_u] sister. However I have to say I do love [name_u]Romy[/name_u] & [name_u]Winter[/name_u] this is merely personal preference.
Looking at the middle names for the girls I really love [name_u]Winter[/name_u], [name_f]Kate[/name_f] & [name_f]Celeste[/name_f] I’m not overly keen on [name_f]Sienna[/name_f]. Personally [name_f]Sienna[/name_f] has lost her shine.
Combination wise I love [name_f]Audrey[/name_f] [name_f]Kate[/name_f] & [name_f]Audrey[/name_f] [name_u]Winter[/name_u]. [name_f]Audrey[/name_f] [name_u]Winter[/name_u] feels cooler. I love [name_f]Carys[/name_f] [name_u]Winter[/name_u] this would be ultimate name for a winter baby as the name would loosely translate as winter love. Regarding pronunciation of [name_f]Carys[/name_f] as a [name_u]Brit[/name_u] this name is very recognisable couldn’t comment on US though sorry
I also love [name_f]Joanna[/name_f] [name_f]Kate[/name_f]! [name_f]Joanna[/name_f] [name_f]Kate[/name_f] is so timeless.
You’ve had a few suggestions so once again count any repeats as me being in agreement with the berries
[name_u]Miles[/name_u] [name_u]Elliott[/name_u] and…
[name_f]Adela[/name_f] [name_f]Celeste[/name_f]
[name_u]Ruby[/name_u] [name_f]Celeste[/name_f]
[name_f]Daisy[/name_f] [name_f]Celeste[/name_f]
[name_f]Felicity[/name_f] [name_u]Winter[/name_u]
[name_f]Susannah[/name_f] [name_u]Winter[/name_u]
[name_f]Annabel[/name_f] [name_u]Winter[/name_u]
[name_f]Lola[/name_f] [name_f]Kate[/name_f]
[name_f]Cordelia[/name_f] [name_f]Kate[/name_f]
[name_f]Bella[/name_f] [name_f]Kate[/name_f]
[name_f]Hope[/name_f] this helped