Just curious. Dsis has 2 stepchildren. She has a good relationship with her DSS (less so with her DSD). I buy Christmas presents for both step children as well as Dsis’ daughter, my niece.
DSS always sends thank you notes and writes and calls me Aunty Eastie. DSD rarely thanks me and when she does refers to me by first name. I’m absolutely fine with both. In my head I really only think of my sister’s daughter as my niece. However my sister thinks that is ‘harsh’. I am fond of her step children, even her stroppy teen DSD who is nice some of the time:) But they have their own biological aunts and uncles so I don’t understand why they’d need another non related one?