Shinjuro had taken you to his house since your older farther, the serpent hashira, couldn't take care of you for the month his 2 sons (You are about Sanjiros age) were looking at you

Shinjuro: "These are my sons, the older one is kyujuro and the younger one is Sanjuro just.. Hi do kid stuff or whatever.." He took a swig of beer and walked away

Kyujuro: "You can just call me Rengoku!" He was blushing a bit and his brother was entirely red