You've left me a bit confused, tbh, Jennyjoan!
If there's no need for a wireless connection then simply using cheap earphones, plugged directly into a radio, would suffice. (You'd need separate radios though unless you used a splitter to share the output from one radio to two sets of earphones).
Discount stores sell cheap (wired) headphones, earphones and earbuds, typically for between £1 and £5. Some discount stores also sell splitters or you can buy them cheaply online:
https://www.gear4music.com/Recording-and-Computers/2-x-Stereo-Minijack-F-to-Stereo-Minijack-M-Adaptor/1JZU