I would consider [name_m]Jorah[/name_m] and [name_m]Jeriah[/name_m] as well if continuing the J theme.
[name_f][/name_f]Personally, I would feel boxed in for future future children if all 3 were to do J and I wouldn’t want to do that but I also see the appeal of continuing. I just personally wouldn’t.
[name_f][/name_f]For a brother, I would probably do something like [name_m]Benaiah[/name_m] or [name_m]Hananiah[/name_m] or even [name_m]Mordecai[/name_m] for a biblical theme.
[name_f][/name_f]For a sister, [name_f]Galilee[/name_f] is lovely. Maybe also [name_f]Zipporah[/name_f]?
[name_f][/name_f]More long name options for [name_f]Roni[/name_f]: [name_f]Veronica[/name_f], [name_f]Bronwen[/name_f], [name_f]Verona[/name_f], though those might be discordant with the sibling names.