It’s parents or elder brothers and sisters the persons who have to talk about engagement to and with the younger kids of the family, when these ones ask questions or the first mentioned people notice the younger siblings have questions in their heads; with children, for example, when they wonder about how babies come to the family and are in mom’s belly.
And all in the context of human love to the whole other person’s aspects and features.
Engagement is a period to get to know the other person further. Maybe the other person will become their future spouse, and dad or mom of the children.
As always these nice conversations should be better boys with dad and girls with mom, or correspondent siblings. / Photo from: father-son-talk cultureofrespect org