Family ordered by number

What makes you think she's six months old? They are ordered from eldest to youngest, nowhere does it mention their ages...

Nr 1 is the first born, end therefore the eldest. Nr 7 in the seventh of the cousins to be born etc...

These pictures are for their grandma to show their order of birth and from which of her own childen. Both pictures are now timeless because though the numbers may increase, the order and branch will never change, unlike ages.

Goddammit, so that they're grandma can identify them better