serious reply here
You are worried because,like almost everyone else ... spiritually you are infantile. Meaning, there's a really small child within you that stopped growing at a very youg age as your body kept developing.
That child needs nurture and affection "to grow up" just like you did. When that is complete the emotional ties with the biological parents automatically dematerialize.
Until then you will continue to "feel the need" to be "nurtured" by your parents. Normally, your relationship with them should evolve into a friendship as you pass your teen years and become an "adult".
Also, most mindpatterns are defined in the childhood through them as they are the closest to you and you create things you need to correct.
The mindpatterns you have created via your parents, need to be eliminated, and replaced with whatever you desire for yourself. This is why you came into this life.
So: you need to "grow the child within", and eliminate all mindpatterns initiated by your parents, and reflected by others throughout your life.
I'll give you a quick example : you are really small..and your mom abandones you. It can be literally, or as simple as her not being attentive to you right at the moment you needed it. So you created yourself this mindpattern with the scope to learn to correct it. So later on you keep attracting people, parteners, relationships or situations where you feel " abandoned " one way or another. You need to eliminate it first the energetic imprinting at the source, then all the negativity attracted and reflected by others.
etc .. there are many of them.
On the other hand Bay, you need to respect your parents and what they chose to experience in their respective lives, good or bad, and realize that physical death is just a transgression of the soul personality to other realms and experiences. In actuality, desincarnated THEY ARE CLOSER TO YOU THAN EVER and you can contact them at any time. If they consider that it's appropriate, they'll answer depending on what is their focus at that particular time.
They will go when they consider it is TIME for them to go, and you better come to terms with your relationhip before that moment, as it will be harder after, but still doable.
Let me know if you understand this.