I meant this is the way they teach it in schools where I live. It’s not about tallest. It’s that the middle is the pillar of the family. Mum is on dad’s left because the eldest son is dad’s “right hand man” and then naturally you have the most dependents on the ends (grandparent and baby). It’s based on family hierarchy but also how they sat at a table. Dad at the head of the table and his wife on his left and his eldest on his right.

Baby finger is obvious, it's cause it's little
If your fingers were a family it would be the baby
Tallest is daddy finger next is mommy finger then older sibling and baby finger, the thumb is the dog