My mum has always given me say £100 each for my dds for Christmas and Birthdays. I then choose what I think they would like. Order and wrap it and put it together with the rest and say this is what grandma bought you.
When myself and siblings were little my grandma chose all our gifts herself. Wrapped them and gave them to us after lunch so we had more gifts to look forward too.
This year I'm thinking of handing the gifts to my mum but I don't think she will see the point. She never wrapped when we were younger. I did it all.
Their other nan usually gives them pjs and £20. I give them that money to spend on what they wish.
How does it work in your family?