de los tíos que más... = from/among/what

[rossetina]

como traduciría :
de los tíos que más marcaron su infancia , fué su tía Franciska
sería " among aunts who most marked his childhood, was aunt Franciska" ???

 

[aztlaniano]

Among. "Of" también es posible.
Among the aunts or uncles

 

[k-in-sc]

But not "marked," unless maybe she used to beat him with a belt
How about more than one sentence? What is this for?

 

[rossetina]

se refiere a marcaron su vida, o influenciaron su vida

 

[k-in-sc]

Among the relatives who most shaped/influenced his childhood was his Aunt Franciska/his aunt, Franciska [if he only had one aunt].