Caleo
Rosie, you might tell us exactly what "parental input" as this is important.
Did they have a house with books and no television or computer games? Did they insist on outdoor exercise and healthy food? Was having books read to them fun for their pre-school kids? Were conversations in their house inquiring and curious about the big world?
Encouragement, creating a space in a teeny tiny house where study could be achieved despite a sibling (shared bedroom) with complex special needs, parents going without to facilitate a 'special interest' (sorry, not going to be more specific as could be identifying)
Limited TV, extensive computer literacy but a limit on computer games (too generous in my opinion lol) books a plenty (express an interest or passing thought and either parents or grandparents bought appropriate books), exhibitions, workshops, physical exercise, definitely healthy food alongside a good dose of unhealthy popular fast food, open conversations about anything and everything, encouragement to explore other views......
I'm extraordinarily proud of my son and daughter-in-law, they have encouraged my grandson to develop his own views, morals, and norms while exposing him to as much variation as possible.
All this while dealing with two completely different children. One who is highly gifted and intelligent, the other who is neurodiverse and educationally challenged. Both equally loved and valued by us all.