Here you can see some examples of irregular comparison in english language grammar.
I have more historical the drama books
My essay is better than David’s.
She has more luck than knowledge.
He has less money than me.
Double forms of irregular comparison:
Older and oldest denote age:
He is older than you.
This is the oldest book I have.
Elder, eldest are used before names of relationship to indicate seniority.
My elder brother is seven years older than me.
She is the eldest member of our football club.
Never use than after elder.
Farther, farthest are refer to distance.
Further, furthest are refer to distance, also they are used with abstract notions.
Do you need further help? – abstract
He lives at the farther (further) end of the town. – distance
Later, latest indicate time.
Latter, last indicate order.
I haven’t see the latest news on TV.
This shoes are latest fashion.
I saw him last week.
This is her last warning.
I will have dinner later.
Later this night, we will go outside.