It seems to be some kind of watermelon. Here’s what you do. Trim it back, don’t let it take over any more of your garden patch then you are willing to give it. That way it will put more energy into the existing melons and they will be twice as good. If they are good save some seeds and plant again next year. If not you didn’t waste a lot of garden space.
YES! That was my initial reaction. Just remember however that were dealing with politics here....nothing serious, but when you're dealing with your father in laws garden, who doesnt want to trim ANYTHING, it makes for interesting times. But I'm going to say you're a professional and suggested this to be done....then start snipping!!
Father-in-law oh..... well good luck my friend lol!
Ah you understand then! Thank you :)