My story has a BIG family. Here are the ages and gender.
Grandmother, 74
Grandfather, 72
Father, 49
Mother, 47
Girl, 22
Girl, 20
Boy, 18
Boy, almost 17
Girl, 15
Boy, 12
Boy, 10
Boy, 8
Girl, 6
Girl, 4
Boy, 2
Boy, 1
Expecting girl
That’s 16 to name! You don’t have to do all, but you may if you want.
Grandmother, 74 - [name_u]Francis[/name_u]
Grandfather, 72 - [name_m]Rodger[/name_m]
Father, 49 -[name_m]Greg[/name_m]
Mother, 47 - [name_f]Julia[/name_f] [name_f]Renee[/name_f]
Girl, 22 - [name_f]Agatha[/name_f] [name_f]Lenore[/name_f] “[name_f]Aggie[/name_f]”
Girl, 20 - [name_f]Candace[/name_f] [name_f]Rose[/name_f]
Boy, 18 - [name_u]Mason[/name_u] [name_m]Oliver[/name_m]
Boy, almost 17 - [name_u]Porter[/name_u] [name_m]Jacob[/name_m]
Girl, 15 - [name_u]Juniper[/name_u] [name_f]Faye[/name_f]
Boy, 12 - [name_m]Nathan[/name_m] [name_m]Philip[/name_m]
Boy, 10 - [name_u]Owen[/name_u] [name_u]Lee[/name_u]
Boy, 8 - [name_u]Chase[/name_u] [name_m]Viktor[/name_m]
Girl, 6 - [name_f]Bonnie[/name_f] [name_f]Amoret[/name_f]
Girl, 4 - [name_u]Harper[/name_u] [name_u]Wren[/name_u]
Boy, 2 - [name_m]Liam[/name_m] [name_m]Killian[/name_m]
Boy, 1 - [name_m]Wyatt[/name_m] [name_m]Xavier[/name_m]
Expecting girl - [name_f]Lydia[/name_f] [name_f]Noelle[/name_f]
Since I know nothing about this family this is what I picked off the top of my head 
But if you tell us more about them it might be easier!
That’s 16 to name! You don’t have to do all, but you may if you want.
You haven’t told us anything about said family so I’m just throwing names at you. I love naming big families xD
Grandmother, 74: [name_f]Rosemarie[/name_f]
Grandfather, 72: [name_m]Fitzgerald[/name_m] “[name_m]Fitz[/name_m]”
Father, 49: [name_m]Rufus[/name_m]
Mother, 47: [name_f]Katherine[/name_f]
Girl, 22: [name_f]Juliette[/name_f] “[name_u]Jules[/name_u]”
Girl, 20: [name_f]Samara[/name_f] “[name_u]Sam[/name_u]”
Boy, 18: [name_m]Roman[/name_m]
Boy, almost 17: [name_u]Flynn[/name_u]
Girl, 15: [name_f]Lucy[/name_f] “[name_u]Luce[/name_u]”
Boy, 12 [name_m]Beckett[/name_m] “[name_u]Beck[/name_u]”
Boy, 10: [name_u]Bellamy[/name_u]
Boy, 8: [name_u]Jamison[/name_u] “[name_u]Jem[/name_u]”
Girl, 6: [name_u]Bo[/name_u]
Girl, 4: [name_f]Davina[/name_f] “[name_m]Davey[/name_m]”
Boy, 2: [name_m]Dashiell[/name_m] “[name_u]Dash[/name_u]”
Boy, 1: [name_m]Benjamin[/name_m] “[name_m]Benji[/name_m]”
Expecting girl: [name_f]Maeve[/name_f]
Grandmother, 74 - [name_f]Blythe[/name_f]
Grandfather, 72 - [name_m]Jack[/name_m]
Father, 49 - [name_u]Arlen[/name_u]
Mother, 47 - [name_f]Caroline[/name_f]
Girl, 22 - [name_u]Bailey[/name_u]
Girl, 20 - [name_f]Georgia[/name_f]
Boy, 18 - [name_u]Ryan[/name_u]
Boy, almost 17 - [name_u]Devon[/name_u]
Girl, 15 - [name_f]Annabel[/name_f]
Boy, 12 - [name_u]Luca[/name_u]
Boy, 10 - [name_m]Zack[/name_m]
Boy, 8 - [name_u]Charlie[/name_u]
Girl, 6 - [name_f]Harriet[/name_f]
Girl, 4 - [name_f]Tess[/name_f]
Boy, 2 - [name_m]Justin[/name_m]
Boy, 1 - [name_m]Kaden[/name_m]
Expecting girl - [name_f]Michaela[/name_f]