Responses
this seems to fit, but the younger bro is way younger
https://www.mangago.me/read-manga/brother_am_i_cute_lovena_luv/
Yes it is! Yes he is very much baby, and he will always been lil’ bro.
it's a sweet wholesome story about little bro and big bro trying to make a living after mom and dad dies. the two respectively end up picking the jobs that their parents previously had and it's implied that the talents they received is directly involved with their parents even when they were gone. the little guy became an artist and big bro got into translating