Dan Kelly was Ned's younger brother ( born in 1861) and he wore Ned's outgrown hand-me-downs.
Dan was an intelligent young man, and had Ned listened to him history might have turned out differently.
At Stringybark Creek Dan suggested McIntyre (the policeman) might escape and should be handcuffed,
he wasn't and the lucky officer escaped. At Glenrowan Dan suggested the towns sole police officer named
Bracken be secured (handcuffed) and yet again he was ignored and the policeman escaped.
It was Dan who foresaw the possible consequences of letting the Glenrowan Siege prisoner schoolmaster
Thomas Curnow go home to collect his 'dancing boots', Dan realised Curnow lived near the police station.

        It was a visit to Dan in April 1878 by Constable Fitzpatrick that caused what was to be known as the 'Kelly Outbreak'. 

                                 Dan Kelly.

"Dan was the youngest of “Red” Kelly’s three sons. All accounts of 
him show that he was of a quieter and less forceful nature than his 
brother Ned, although the general public have been led, through the 
vicious misrepresentation by the police, to regard him as a treacherous 
and bloodthirsty scoundrel. This misrepresentation was encouraged 
to some extent by the remarks of his brother Ned when addressing 
the men imprisoned in the storeroom at Faithfull’s Creek station near 
Euroa. In order to prevent anyone from attempting to escape Ned 
Kelly said: “If any of you try to escape, Dan Kelly and Steve Hart 
will shoot you down like rabbits just for the fun of it.” This was taken literally, and
Dan Kelly was regarded by those who were not personally acquainted with him as a
bloodthirsty ruffian. Although he was regarded as an outlaw from the time he was 17
years of age till he was 19 years at his death at Glenrowan, he killed no one, he shot
no one, offered violence to no neighbour and insult to no woman."

Source : J.J. Kenneally.'The Inner History of the Kelly Gang' 1969 edit.