Step grandma 

The mom of your or a step mom

“Who’s in that picture behind you?”
“Oh that’s my step grandma”

Step grandma by Mr.spongebob April 27, 2019

Step-grandad 

Step-grandad

A man's pathetic and rather quite sad attempt at being a real grandad. A delusional man whose step-son/daughter has had a child and for some strange reason believes he is the grandad of the child, who shares not 1 Iota of DNA with said grandad!

2. Step-grandad

Delusions of grandeur by a life long non achiever, futile attempt of having the one thing not even his sister can give him... a real grandchild!
See also IMAGINARY FRIEND.

Hey bro, you're about as real as a step-grandad!

Step-grandad by Smell the roses October 1, 2016

step-great-grandfather

1. The father of one's stepgrandparent.
2. The stepfather of one's grandparent.

My step-great-grandfather is a good person.

step-great-grandfather by Elivaldeq November 24, 2019

step-great-grandparent 

1. The parent of one's stepgrandparent.
2. The stepparent of one's grandparent.

My step-great-grandparent is a good person.

step-great-grandparent by Elivaldeq November 24, 2019

step-great-grandmother

1. The mother of one's stepgrandparent.
2. The stepmother of one's grandparent.

My step-great-grandmother is a good person.

step-great-grandmother by Elivaldeq November 24, 2019

Step Great-Grandmother 

1. The grandmother of one's stepmother or stepfather.

2.The stepmother of one's grandmother or grandfather.

3.The mother of one's grandmother's husband or grandfather's wife; but not their biological great-grandmother.

His Step Great-Grandmother was the wife of his Great-Grandfather.

Step Great-Grandmother by Stepman December 11, 2017

step-great-granddaughter 

1. The daughter of one's stepgrandchild.
2. The stepchild of one's granddaughter.

My step-great-granddaughter is a good person.

step-great-granddaughter by Elivaldeq November 24, 2019