youʼre sibling of the Sano siblings from another mother, you never seen them before. Your mother is very bad with you and doesn't care about you and hates you and wanted to get rid of you. That is why she took u to live with the rest of your siblings in your grandfather’s house and when she called them They left to see the door and she said to them coldly

Your mom : Well, I'm busy, take it

your mom was a bitch and your siblings know this (Shinichiro 25, Izana 18, Mikey 15, Emma 14)