In most scenarios an able-bodied father should protect the family, (including wife and kids), a mother should protect her kids, (after the husband is gone), and oldest siblings should protect younger siblings, (after the parents are gone). If a young child is protecting both mom and dad, something is severely wrong in that scenario. According to Sikhi all of these souls are equal, but by all accounts calling them equal in the pecking order is just not common sense.
The ones calling Dhan Dhan Shri Guru Harkrishan Ji a child should have a deeper look at themselves on how they view Guru Sahib instead of saying a normal child should be a leader.