I've seen some things that both DC would like but it would be wasteful to buy two of the same. Some things aren't huge things, such as walkie talkies, a Bluey play set, a set of two remote control cars etc. A bigger thing I was thinking of was maybe a kitchen. Would it be unreasonable to give the dc some joint presents that aren't huge presents like a switch? DC will still get individual gifts and stockings. They're 6&4.