Step daughter

We’re finally going to get my fiancé’s daughter to keep throughout some weekends. With that being said I have a 10 year old and kinda rusty when it comes to toddlers. What are something’s we can get to make it fun here?! Things you can’t live without. Things your toddlers can’t live without. And as always I would love advise!!

Also I need to get her a car seat what is the best car seat to get for a 2 year old?

Thank you!! 🩷🩷