Brother: How about names like [name_m]William[/name_m], [name_u]Campbell[/name_u], [name_m]David[/name_m], or [name_m]Harrison[/name_m]? Sister #1: [name_f]Margret[/name_f], [name_f]Imogene[/name_f], or [name_f]Cleo[/name_f] Sister #2: [name_f]Julia[/name_f], Serephina, or [name_f]Ruth[/name_f]
For middle names, how about [name_m]Hobart[/name_m] for the brother? [name_f]Wilma[/name_f], [name_f]Gloria[/name_f], or [name_f]Lavender[/name_f] might work for the sisters’ middle names.