Christmas Gift for boyfriends ex wife?

The mother of his 8yr old twins who he spends Christmas with each year...

We’ve been together for 3 years and I’ve not met her or the twins yet (they live outside the country). Spoken to the twins but have never spoken to her.

I want to send some gifts for the kids this year and thought it would be nice to send something for her too. My questions are:

1 - would it be weird to send something

2- if not, what would be a good thing to send