[name_f]Catherine[/name_f] - just gives me strong oldest sister vibes
[name_f]William[/name_f]
[name_m]Thomas[/name_m]
[name_f]Elizabeth[/name_f] - could go either way, depends on the nickname as well
[name_f]Anna[/name_f] - I know 3 Annas and all of them are the youngest daughter
[name_m]Benjamin[/name_m] - because of “the [name_m]Benjamin[/name_m] of the family”
I think I put them this way just because the one [name_f]Elizabeth[/name_f] I know, and the several Catherines are all the oldest child. I think [name_m]Thomas[/name_m] and [name_f]William[/name_f] make great brothers and would probably be close in age. Then, one of the Anna’s I know is the younger sister and several Benjamins are the youngest sibling.
[name_f]William[/name_f] gives me older brother vibes. [name_m]Benjamin[/name_m], in my mind, always shortens to Beny, which feels like a youngest-kid name.