Who are the parents in Mark 10?

Sinclair Ferguson:

Jesus is speaking about children whose parents are already disciples (and will in turn 'disciple' them). Such parents know they need to teach their children the responsibilities of kingdom life, as well as the privileges of kingdom possession. If the blessings of God are rejected in disobedience, they are forfeited. Nothing that is said here implies ... that irrespective of their response to Jesus these children were automatically guaranteed salvation.... or any other position on the part of Jesus.

--Sinclair Ferguson, Let's Study Mark, p.162