I,m glad it went ok with the older ones, yes I would think they did think "what took you so long". It is initially the practicalities that concern them and your right more will come in dribs and drabs.
I guess they just want both of you to be happy and can see that is not happening whils you are together.
I think the little ones could suprise you too with a philosophical outlook and also be more concerned with practicalities.
Wishing you well. I know you will handle it with love and honesty.