Name For A Group Of Siblings?

Hey there! I need a name for a group of siblings; specifically the oldest & youngest.

The siblings:
??? (18, M)
[name_f]Abigail[/name_f] (16, F)
[name_m]Gilbert[/name_m] (12, M)
??? (7, F)

They’re all adopted by the same father & have the surname Amitola, which means rainbow. They’re all loving and family oriented, but they do bicker of course.

Thank you in advance!