In the Season 1 episode "Beaver and Henry," Larry mentioned his little brother. I don't recall the little brother ever being mentioned again.

I thought there was a little brother mentioned only once. We know he has a married older brother and an older sister.

With Mrs. Mondello's obvious age it's unlikely he would have a little brother.

Here is a picture of Larry's Dad - may be the only one +-

How old do you think Mrs Mondello was. Larry had a married older brother and a ? high school aged sister. Maybe older brother was 22-24 and sister 17 at one point in the series.

Mrs Mondello! She was born in 1899 and the show ran from 1957 to 1963, so she was between 58 and 64

Yes, she was pretty old. My grandparents had a similar situation--my dad was the youngest of three boys, and their little sister was born ten years after my dad.

I had an uncle older than HIS Uncle

I think Larry was nice...

I dont remember his brother....

Madge was born in 1899 but we do wonder how old Mrs Mondello is . She looked older for the actress was older than much of the cast. Larry is 10, sister 17 and brother 22. Mrs mondello could anywhere in the age of 42- 55. Larry could have been born when MRs M was 45. By looks, she more in the upper range.