If your kids are like mine though, I'd go to Cadbury world and the aquarium 😑

It's very good for pre-rapharite art, lots of local connections. If you like that kind of thing you should look at the stained glass in the cathedral or even somewhere like wightwick manor over in wolverhampton, which is an arts and craftsmovement masterpiece.

Aston Hall - big old Tudor era house
The Aquarium
The museum and art gallery is good if you like that kind of thing
There's loads of heritage stuff down the jewellery quarter (the coffin works etc)
There's also the Chinese quarter for food