We had the same issue last year when my daughter was 19 months and will to a similar extent this year too! We got my son a play kitchen when he was her age but it was a wooden one and is still used by both kids! She’s got his old scooter and balance bike too as again we got good quality so they are still in great condition. She just needed a new helmet for her birthday.
Last year we started doing the something you want, something you need, something to wear, something to read, something to do (this last one has a few variations but we did do), we got them two from each category then they had one present from ‘Santa’ and one from each other plus their stocking with some chocolate, socks, a couple of small fidget toys (DS has ADHD/ASD so we go through a lot of them!) and Xmas Eve box with new pjs, a book, some hot choc and few chocolates. It helped me to not go crazy with buying stuff too.
For the youngest I got the
‘want’ - Bluey car and some figures & a doll
Need - a Bluey nightlight/torch & some flashing Bluey wellies (we like Bluey in this house 😆)
Read - 2 acorn woods book we didn’t have from DS being younger
Wear - two outfits in her next size
Do - a small duplo set (to add to the box from her brother) & some playdoh
She got a music box (the wind up kind with the magnetic twirling characters on top) from DS as he has one and wanted her to have one too
they had swimming boy and girl dolls (baby Bjorn) from Santa as that is what DS told santa they wanted ‘ l want a baby boy swimming doll and my sister wants the baby girl one). They are actually pretty cool and they both love them.
My parents got her a dolls house & a set with a small crib, car seat & a high chair for her dolls with bottles and feeding bowl.
This year I’m thinking/have already bought;
Some more Bluey figure sets
Some clothes/sleeping bag for her dolls
bluey play doh set (she’s asked for play doh, it’s all she’s asked for!)
A smeds and smoos t shirt as she’s obsessed with ‘the purple baby’
We’ve also bought tickets for Bluey’s Big play for both of them and I’ve asked grandparents to just buy a few things then give us money towards an annual pass. My parents are going to do the 5 categories (but just get one small thing from each) then give us the money for the annual pass. We got so much use from a Legoland pass we asked the in laws for last year (we’re about an hour away)
Sorry that’s long but might give you some ideas!