the process of promoting and supporting the physical, emotional, social, and intellectual development of a child from infancy to adulthood  is called Parenting. Do you have kids?
I do not.  What else do you know about parenting
it also refers to the intricacies of raising a child aside from the biological relationship.
Are there classes you can take to teach you how to be a parent?
there may be but The most common caretaker in parenting is the biological parent(s) of the child in question, although others may be an older sibling
So siblings can be parents too?  That is weird.
not really, i had the experience while growing up, it helps when you become an adult. others are grandparent, a legal guardian, aunt, uncle or other family member, or a family friend.
I do know some people who were raised by grandparents so that does make sense