Interactive present idea for nephews

[TallulahBellatrix]

Hi, I wonder if anyone can help me come up with the ultimate present idea for our nephews?
They are 5 and 3, I would love to get them something interactive they can play with together, rather than having to get them each the same / similar to avoid any present envy! Budget of about £20
Any ideas would be very welcome, thankyou

The first interaction they can have is the battle over who gets to open it.

Id go for two gifts which can be used together :- a remote control car each which they can race or similar?

Pair of Walkie talkies, wrapped up in two parcels.

Cranium Hullabaloo is fun, good for both ages and also gives them something active to do on Christmas Day although have just done a search on it and they seemed to have stopped making it :-(