I'm grateful to know that you've managed to retrieve information for your family members. I can certainly empathize with the frustration many of us family genealogists regularly face when inviting other family members--including (typically overly-busy young parents) to get involved in genealogy. If your experiences are anything like mine, despite some initial interest and superficial enthusiasm, energies quickly wane to be directed toward (possibly more important things) such as child care, education, health care, tutoriing, after-school programs, etc.
So while WikiTree's official position makes sense on the face of it, it seems we're most likely still caught in a bit of an awkward phase with respect to the idealized expectation of all parents managing their own profiles on WikiTree along with their children's profiles--and the reality I've seen much more of in which very few young parents manage their own profiles at WikiTree, let alone their childrens'.
Perhaps we can put our collective thinking hats on and come up with a more practical, more realistic solution?