What fun! [name_f]Ada[/name_f] is a great choice and a fun name to play off of [name_f]Ado[/name_f] [name_f]Annie[/name_f] (whether or not [name_f]Ado[/name_f] [name_f]Annie[/name_f] is referenced or makes an appearance in your writing).
Here are some ideas for the [name_m]McLain[/name_m] clan …
The Oldest / The Only Boy …
[name_m]Ben[/name_m]
[name_u]Bert[/name_u]
[name_m]Clarence[/name_m] / [name_f]Clary[/name_f]
[name_f]Cleo[/name_f]
[name_m]Clifford[/name_m]
Curly
[name_m]Curt[/name_m]
[name_m]Elmer[/name_m]
[name_m]Eugene[/name_m]
[name_u]Francis[/name_u] / [name_m]Frank[/name_m]
[name_m]Frank[/name_m]
[name_u]Gene[/name_u]
[name_u]Hollis[/name_u]
[name_m]Holt[/name_m]
[name_m]Homer[/name_m]
Huck
[name_u]Jean[/name_u]
[name_m]Joe[/name_m]
[name_m]John[/name_m]
[name_u]Johnnie[/name_u]
[name_m]Milton[/name_m] / [name_m]Milt[/name_m]
[name_m]Orville[/name_m]
[name_m]Pete[/name_m]
[name_u]Stanley[/name_u] / [name_m]Stan[/name_m]
Teeny (as a junior name or nickname)
The Youngest Children / The Three Youngest Girls …
[name_f]Betty[/name_f]
[name_f]Carrie[/name_f]
[name_f]Clara[/name_f] / [name_f]Clary[/name_f]
Curly / Curly-[name_f]Sue[/name_f]
[name_f]Dorothy[/name_f]
[name_f]Effie[/name_f]
[name_f]Eleanor[/name_f]
[name_f]Elva[/name_f]
[name_f]Fannie[/name_f]
[name_f]Flossie[/name_f]
[name_f]Ida[/name_f]
[name_f]Hannah[/name_f]
[name_f]Helen[/name_f]
[name_u]Hollis[/name_u] / [name_f]Holly[/name_f]
[name_f]Jeanie[/name_f]
[name_f]Kathleen[/name_f]
Lauraine
[name_f]Lela[/name_f]
[name_f]Lillian[/name_f]
Lu
[name_f]Mable[/name_f]
[name_f]Maggie[/name_f]
[name_f]Mamie[/name_f]
[name_f]Mildred[/name_f] / [name_f]Milly[/name_f]
[name_f]Minnie[/name_f]
[name_f]Nell[/name_f]
[name_f]Nellie[/name_f]
[name_f]Nettie[/name_f]
[name_f]Norma[/name_f]
[name_f]Sue[/name_f] / Curly-[name_f]Sue[/name_f]
[name_f]Susan[/name_f] / [name_f]Susie[/name_f]
[name_f]Wilma[/name_f]
Teeny (as a junior name or nickname)
Here are my favorite combinations in birth order (i.e. BOY, [name_f]Ada[/name_f], G2, G3, G4) …
Curly, … [name_f]Ada[/name_f], … [name_f]Lillian[/name_f], … [name_f]Flossie[/name_f], … and [name_f]Nell[/name_f]
[name_m]Frank[/name_m], … [name_f]Ada[/name_f], … [name_f]Susan[/name_f], … [name_u]Hollis[/name_u], … and [name_f]Wilma[/name_f]
[name_u]Gene[/name_u], … [name_f]Ada[/name_f], … [name_f]Minnie[/name_f], … [name_f]Clara[/name_f], … and [name_f]Effie[/name_f]
[name_m]Holt[/name_m], … [name_f]Ada[/name_f], … [name_f]Kathleen[/name_f], … [name_f]Mamie[/name_f], … and [name_f]Sue[/name_f]
Huck, … Ada, … Lu, … Jeanie, … and Mable
[name_u]Jean[/name_u], … [name_f]Ada[/name_f], … [name_f]Eleanor[/name_f], … [name_f]Dorothy[/name_f], … and [name_f]Lela[/name_f]
Let me know if we can help you come up with more options!