I'm not sure of your question but if you're interested in whether souls can reincarnate, then apparently yes we do. I don't know if they choose to reincarnate into members of their own family. Do you recognise you DD as someone else?

I recommend a couple of books by Brian Weiss and Michael Newton. Both of them are psychiatrists who discovered that, during hypnotherapy, a number of patients regressed into past lives and sometimes into the life between lives. It's fascinating reading.

Michael Newton's books include Journey of Souls, Destiny of Souls & Memories of the Afterlife
Brian Weiss' books include Many Lives, Many Masters; Same Soul, Many Bodies as well as others.