Glasgow- Loads for children to see and do. Entry is free to public museums.
Seeing as you only have 2 days, you could buy an all day underground ticket and explore some of the west end of the city. These 3 stations are all beside each other and there are several things to do nearby.
Hillhead Station
Byres Road and Ashton Lane - lots of cafes and restaurants and Corollas Ice Cream is good.
Botanic Gardens- Glasshouse and Nature Trails to take. Good if your DC like doing nature walks and spotting things.
The Huntarian Museum at Glasgow Uni could be worth a trip if your DC are interested in Natural History.
Kelvinhall Station
Kelvingrove Art Galleries and Museum. Has lots of things designed with children in mind. Good if your children like dinosaurs and mini beasts.
Orlando Cafe on Argyle street across the road- good for ice cream and chips.
Large playground and skate park a short walk away in Kelvingrove Park.
Partick Station
Riverside Museum and Tall Ship- worth a trip if your DC are interested in transport ( old cars, bikes etc) and boats.
If you wanted to go to the Science Center, you can take a different train to the ‘Exhibition Center’ stop. Science Center has an entry fee but is worth a visit if you have time. It’s very interactive.