Wireless Microphones used to cost a bomb. Thanks to advancement in technology, all things wireless cost a fraction of what they used to. I got hold of a Wireless Mic for just 89 Yuan (S$18), and it’s the set with a mini stand. It worked right out of the box. Two pieces of AA batteries as well as a 1/4″ to 3.5mm stereo plug adapter are included. No audible noise. Happy.
If your old folks are the Karaoke loving type, this would make a nice (and cheap but not cheap looking) gift. The lowest end one (the one i got) uses slightly cheap feeling plastic, but you can choose the higher end metallic one for just a bit more.