KANAKO became 'Aunt'.

KANAKO updated Instagram and told that she had became an aunt (her brother had a baby).
She says in the comments section that "Her forehead is similar to mine".

In addition, the clothes that the baby is wearing in the photograph are gifts KANAKO gave.
This clothing brand seems to be 'Familia', and it is connected with the story that KANAKO played in the TV drama "Beppin-San"(2016).