I'm confused .who is this new red haired guy ?

I think he's the older brother of the children's previous mother (she also had red hair)

aight....i don't think i was right....

I think it's the eldest brother of the marquess she married. That's why she had to go to the aunt to ask for help cuz she was rejected entry to the main household.

you are

(づ￣ ³￣)づ thanks for the confirmation! Now i'm less confused