The 58-year-old actor said that he, Karan and Dharmendra
would love to work together provided there was a good script.
"Why not? If there is a good script then we would love to work together. I would love this to happen as it will be beautiful. You have to do correct (sic)," Sunny said at a promotional event of his directorial venture 'Ghayal Once Again'.
Sunny, however, preferred not to reveal details about Karan's debut.
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The 'Gadar' star has no tips to offer to his son but insists that he wanted him to do what he liked.
"I don't give tips to anyone. He (Karan) has grown up with us in the house. He knows what has to be done and what not to be done. As a father, I try to support him in whatever he does.
"I always tell him to do what he wants to and not what I want him to do. Because, I did what I wanted to and that is how life should be," he said.
On Dharmendra promoting his film, Sunny said, "Dad loves you all (media). I will have him along with me soon. Next time definitely he will be there. He wants me to be there in front. Otherwise dad, Bobby and we all are together," he added.
'Ghayal Once Again' is slated for release on February 5.
Sunny said that Dharmendra had seen some portions of the film.
"He has seen bits and pieces. He has liked it. There are some creative points that we are discussing. I cannot talk about it. He is feeling positive about it," the actor said.
"This is my acid test as after this I will come to know from the audience what to do next. There are lots of things in my mind but it's too early to talk about them," he added.