I have live with dp and his two children and my own dds. Dd has a birthday coming up and my family usually buy her sibling a little gift as well. Dp is worried that his dc, who are with us on the day, will feel left out as they won’t get anything. He thinks to avoid this we should just do presents for the birthday girl. I’m a bit annoyed though because why should my dd miss out if she is used to getting gifts on her siblings birthday? I can’t expect family to buy for kids not biologically related to them!