Me, DH and our DC were visiting my dad today and were discussing Christmas presents.
He was saying he was stressing about what to get everyone and was asking us for some ideas (my siblings, our DC, us). He also briefly said "oh and X & X?" (DHs two older children's names), I think just because DH was there more than anything. I responded telling my dad not to worry about getting DSC anything and he said okay.
Husband on the way home said he thought that was dismissive of me and was upset by the comment as though I don't care about DSC.
My dad and DSC have next to no relationship. They have met a handful of times usually at things involving our DC (their birthday parties for example) and that's it. He isn't close to them and they aren't close to him, probably wouldn't even notice each other in the street to be honest. DSC are 10 (DSD) and 13 (DSS).
So I don't think it's terribly unreasonable to tell my dad to not worry about getting them something for Christmas. In previous years I think he's just bought them a selection box although honestly I can't even much remember.
AIBU to have told my dad he didn't need to buy my step children a present for Christmas.