The cold water will only come out of the kitchen faucet if the bathroom cold tap is turned on or if the cold shower is turned on it worked before just started this please help

Tell me a little about your house. How old is it? What material are the water pipes? Any plumbing work done recently? I thought that in over 50 years in the trade I had heard it all but this is a new one on me. Perhaps one of the other experts has run into this problem before. I'll ask around. Regards, Tom