The historical context behind tanjuro’s knowledge of sun breathing lies with sumiyoshi, tanjiro’s ancestor, who tried to replicate yoriichi’s.
Webtanjuro kamado was the husband of kie kamado and the father of tanjiro kamado, nezuko kamado, takeo kamado, hanako kamado, shigeru kamado and rokuta kamado.
Tanjuro seemed to have some connection to the demon slayer world and was a wise man, but sick and frail.
Webthe wake of the demon's brutality left nezuko, who transformed into a demon, and his brother, tanjiro, who vowed to revenge the death of his family.
Webtanjiro's father, tanjuro kamado, was known to be a sick and frail man.
He was suffering from an illness that made him weak and died even before the series began.