Could this be your John and Daniel? (Will check for these two on the 1920, in case their names really are Loughlin.)
1910 Cambridge Ward 3, Middlesex County, Massachusetts
John Loughlin (Coughlin)*, age 28, born c1882 in Ireland (English), parents were born in Ireland (English). Single. He was a boader, immigrated 1906, occupation: Slatterman?, Standard Oil?
Daniel Loughlin (Coughlin)*, age 26, born c1884 in Ireland (English), parents were born in Ireland (English). Single. He was a boader, immigrated 1909, occupation: Laborer, Railroad
Address: 197? Portland? St On the previous page, another street mentioned was Plymouth.
The head of household was Abraham Goode (born Ireland/Irish), his wife Bridget, son Michael and a Abraham's brother-in-law (cannot read name).
*Name could be Loughlin.
Perhaps the person giving the information reversed their ages?