My Dad (deceased) had an affair, resulting in a child 24 years ago. She reached out to us via solicitors letter 6 months after his death asking to get in contact. Mum knew of her existence but nothing about her. My Dad and her lived somewhat separate lives but she stayed with him and looked after him through illness.
My Mother burned the letter but I remember the solicitors name so could make contact if I wanted.
Its been almost 4 years since the letter. I dont agree that my mother should be deciding about this. It wasn't her decision to make. At the same time I dont want to hurt her. My sister isn't interested in meeting her. I was the closest to my Dad and tbh would like to meet her.
YABU - leave sleeping dogs lie and dont hurt your Mum.
YANBU-arrange to meet/make contact but keep it from your mum do as not to hurt her.