I, for one, do believe everyone has "it" to some degree. True, not everyone will excel in all or even any of these abilities. Some people don't realize that they do have 'it' though. Such as knowing who is calling on the phone when it rings, though there is no way they really should know this.
I also believe it depends on how one is raised to believe and behave. But this is not all of it, either.
I was raised in a family where my maternal side was very psychic. My mother read cards, is a psychic medium and could read a crystal ball, tea leaves, etc. Her 'specialty' however, were the cards and being a psychic-medium. Her mother and siblings also had these abilities--though only one sister really actively pursued it as my mother did. My grandmothers mother and her siblings were also all psychics and card readers, crystal ball readers, tea leaf readers and you name it. So, I was raised around it, however, my mohter and her family had this rule that they did not teach others how to develop their abilities because if it was meant to be--it would be so.
My own brother and one sister have had experiences with spirits and I am sure they could develop their abilities, but they want nothing to do with it. Mostly out of fear of what their neighbors and friends would think.
However, my niece and nephew of the one sister are also quite psychic. So, yes, I do think it probably runs in families as well.
I don't do anything special to 'protect' my pineal gland so that my abilities will develop stronger. I never even thought about that, tbh, nor heard that one should do this. I do drink purified water because our tap water is not very clean. I have grown up with flouridated water, flouride toothpaste and when younger, took flouride tablets often, as I have terrible teeth, unfortunately. I am a big soda drinker too. Always was, though when I googled about the pineal gland for psychic development, its a big no-no. All my family are big soda drinkers too.
I think we all have our strengths and gifts though. It may be clairvoyance, or clairaudience, etc. or it may be playing the piano, singing, or dancing or drawing and painting. We can also all develop any of these skills to a certain degree as well, if we have the desire to do so and perhaps are trained in such things and practice to make the skills stronger.
As with anything though, there are those who seem to master these things, even from childhood. Then there are some who don't even discover their talents till later on in life. I think it really depends on our own frame of mind, and also our surroundings that influence us and how we live our lives.