[name_u]Love[/name_u] [name_u]Kit[/name_u]! Depends on what full you would consider. I think [name_u]Kit[/name_u] fits better than [name_f]Katherine[/name_f] with [name_m]Benji[/name_m] and [name_u]Arlo[/name_u] due to length.
okay, so if benji and arlo are both full names already, then it should be kit and only kit.
but, if we have a benjamin + charles situation going on, then it should definitely be benjamin, charles, and katherine.
with both the brothers having a nickname, ruby feels wrong. if she went by rue, adorable. but ruby as a full name just no. (e.g. benjamin “benji”, charles “arlo”, and ruby “rue”)
if the brothers are going by a nickname, then cece would work for cecily. however, cecily does not match the vibes of benjamin and charles atall, so she does not get my vote.