Constance, as long as there's life, there's hope. Sixteen is young to be a Mom, but I will throw up some timbers for your granddaughter. Please don't say that you won't get a chance to hold that precious baby.
If your prayer is that Megan and your sweetheart Elizabeth be reconciled to the family, then bring your speech in line with your prayers. The roles of grandparents and great grandparents are significant within the extended family. Parents can be so busy with the business of earning a living, and attending to all the necessary responsibilities of raising children. But, "Grands" have time to impart the wisdom and special nurturing that only they can give. Your contribution is priceless.
Constance, You have a deposit to make in the lives of Megan and your great granddaughter, and I am persuaded that He who sits high, and looks low knows that, too. Nothing happens behind His back. I'll also ask a few friends to pray for your family as well. Pray and believe.