We could go back and forth with this all day, and everyone is certainly entitled to their own opinions BUT at the of the day IMO riding with your younger half siblings (and really I hate the word half) and your father and stepmother in a car or posing with them in front of a church does not make you a family.
You know what makes you a family....showing love, respect and compassion to each other at all times not just because you are in the public eye for show. It what happens behind closed doors. Marie and Joachim showing Felix and Nikolai (as well as Henrik and Athena) that they are loved and cherished by showing them love with affectionate hugs and kisses, attending school recitals, listening to their stories, going to soccer games, etc. Helping them grow into positive members of society. That's being a true family.
And you know what, Marie showing affection to her stepsons at the` end of the christening, gives me hope that this is a true family.