Why is it kinda common in 90s movies that a father would kiss his daughter on the lips or a sister would kiss her brother suddenly for no reason?

What's the point the directors want to send? 🤔
In Meet Joe Black a father kissed his daughter , it wasn't sensual but it's still a kiss and in Face Off this girl's brother took a bullet and she gave him a kiss which was sensual.
Is there an explanation?