School bags are welcomed - lightweight for the kids type of thing - stuffed full of note books, excersise books, pens etc...as suggested.
If they take toys for kids, non-war things should be taken - not toy guns etc.....and nothing needing batteries either...
Also suggest they check with the organisation they are with for the sponsorship, as they may have list of items wanted by the families that the visiting family could provide - wheelbarrows, watering cans and the like come to mind, though not as carry on luggage..........
Mosquito nets may be useful - light and easy to transport, and may go towards malaria prevention...persistant problem of course..
Wind up radios and torches are easy to obtain and might do as well...
And kids clothes perhaps - 'value packs' of tee shirts and the like might be suitable....
How might they be for a dinner service? Sounds silly buit a robust 'picnic set' of plates and bowls including strong cups could be used by all the family.
There is a bit of presumption that the hosts will have absolutely nothing hence the contact to the sponsorship company first, but things as proper presents - and not to overwhelm the family receiving them either....and showing some thought too rather than just chucking money at them would be welcomed.
hope this is of use...