OP here with an update. We did have our 'family meeting'..it was a long day in my neck of the woods. After much soul searching I came to the conclusion that I could not possibly care for an infant on a daily basis. I told my oldest DD that under the circumstances, I could only help out one or two days per week, with the understanding that this would be temporary. I also asked her to be prepared in the event that her grandparent's health took a turn for the worse, or if I find another job. I asked DD and her husband to begin looking into income sensitive childcare ASAP.
As a mother, I have always made a great effort to treat my children equally. I know some of you wondered if our younger DD was the favorite but this is not the case; we let her move back home with our grandson because it was necessary, and their safety took priority. It is painful to know that both my girls are struggling, and they had to reach out to us. From time to time we all need a helping hand, but there is something to be said for being self sufficient. I cannot tell you how grateful I am for the overwhelming response, and support that I have rec'vd from my DIS friends. I want to thank each of you for taking a moment out of your busy lives to share your thoughts with me, and for allowing me to vent my frustrations. You have touched my heart.