According to IMDb, the story is about the life and times of the parents of the hailed British graphic novelist, Raymond Briggs.

Image Souce: IMDb
CHARACTERS | HEIGHTS | AGES | WEIGHTS |
Ernest Briggs | ~ 5ft & 9in | ~ 40 years old | ~ 130 lbs |
Ethel Briggs | ~ 5ft & 3in | ~ 40 years old | ~ 110 lbs |
Raymond Briggs | ~ 4ft & 6.5in | ~ 10 years old | ~ 80 lbs |
ANALYSIS OF THE ETHEL & ERNEST CHARACTERS’ HEIGHTS
Firstly, Ernest Briggs’ height was not mentioned in the movie so; we estimated her height to be 5 feet and 9 inches, an average height of British men based on Colonel Height.
Secondly, Ethel Briggs’ height was not mentioned also so we estimated her height to be 5 feet and 3 inches, an average height of British women based on Colonel Height.
Lastly, Raymond Briggs’ height is estimated to be 4 feet and 6.5 inches, an average height of a child on his age according to On Average.
ANALYSIS OF THE ETHEL & ERNEST MAIN CHARACTERS’ AGES
According to IMDb, Ernest & Ethel were parents of Raymond so, we estimated their ages as 40 years old.
Then, Raymond is estimated to be 10 years old since he was still a young boy in the movie.
ANALYSIS OF THE ETHEL & ERNEST CHARACTERS’ WEIGHTS
The main characters’ weights are based on their heights and ages. Then, we estimated them through the use of the BMI Chart.
Firstly, Ernest Briggs has an estimated weight of 130 lbs because of his height and age.
Secondly, Ethel Briggs has an estimated weight of 110 lbs because of her height and age also.
Finally, Raymond Briggs is estimated to weigh 80 lbs based on his height and age.
REFERENCES
https://www.imdb.com/title/tt1725969/?ref_=ttls_li_tt
https://colonelheight.com/average-height-in-uk-men-and-women/
https://www.onaverage.co.uk/body-averages/average-child-height