AITA for telling my dad he should have talked to me before setting expectations about what I will and won’t do?

A Reddit user shared their experience as the oldest sibling after their father remarried. Having lost their mother when they were young, the user has taken on a parental role for their younger sisters, Lauren and Kyla. However, after their father married Jean, he expected the user to extend that same support to Jean’s children, Conor and Ruby.
When asked to walk Ruby to school, the user expressed that they had not agreed to take on that responsibility and felt hurt that their father had set those expectations without consulting them first. This led to a confrontation where the user explained that they see Jean’s kids more like roommates than family, which upset both their father and Jean. Read the original story below to see how the situation unfolded and share your thoughts.
‘ AITA for telling my dad he should have talked to me before setting expectations about what I will and won’t do?’
Heres the input from the Reddit crowd:
Do you think the user was justified in refusing to take on the role of a big brother for Ruby, or should they have been more willing to embrace their father’s expectations? How would you handle a similar situation in a blended family? Share your opinions and experiences in the comments below!
“why don’t you step up then if she needs someone to accept her at home” nta
I think this should be a time to discuss expectations on both sides and perhaps start negotiating solutions for everyone. Perhaps the writer can agree to walk Ruby and in return dad can start taking on some more responsibilities.