Read Superman VS Goku comic

Did you really need to ask!

yeah they would win easily

Z fighters. Obiously.

it would only take Goku to take care of them

Idk about the super family, but for "goku vs. superman"...

Some versions of Superman would get owned by Krillin, and some could beat SS4 Gogeta with one hand.

For example, the cartoon network version of Superman appears extrememly weak. Everytime he gets blasted by a low level heat ray he screams out in agony while the justice league has to help him up. Or the original Superman, who just has generic flight, super strength, ect.

Other versions, however, are extrememly over powered and could probably kill every single Z Fighter at the same time. Like silver age Superman. He can go back and fourth through time with his speed, survived the collapse of an entire universe, can lift 200 quintillion tons, and (you ready for this?) destroyed a solar system by sneezing in it's direction. Or that weird golden god Superman, who can basically do anything that the Christian God can.

If its Goku at his highest recorded power vs. Superman at his highest recorded power, then Superman would win easily.

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Goku VS Superman...Goku wins, but would probably have to go super saiyan 3 (I never saw GT so I don't know about super saiyan 4)

Vegeta VS Supergirl... Supergirl, as Goku would need to go super saiyan 3 to beat superman, and Vegeta is only a super saiyan 2.

Piccolo VS Batman... This one could go either way, as Batman might pick up on Piccolo's weakness to loud noise, but Piccolo might just rip his ears off or something. In the end, I have to say Piccolo.

Gohan VS Wonder woman... Gohan easily

I would have to say the Z fighters. Especially if they all potara fused. There is no way superman could stand up to an ssj4 Gogetrunktenkrilchaccolientzu (did i forget any z fighters?)