"Don't you want your own children?"

I was recently asked this question by a person who had just found out I was a foster/adoptive mother.  My children were not with me so she was not aware that I do have a biological daughter.  It wasn't relevant to the conversation so I did not clarify the way my children entered our family.  I typically do not clarify for people unless it is necessary.  Biological mothers do not introduce their children via their birth story (thank goodness), therefore, I feel no need to clarify for people in general.

I am indeed infertile.  There have been times when I would love to have had another biological child. More biological children is not going to happen.  I could be snarly when people ask me this, but what good would that do.  So this is how I answered:  "I  consider them ALL my own. In fact I was up at 1:30 am with one who is not my own.  When you are the one handling the middle of the night stuff, they're yours." She laughed and whole heartedly agreed with me.