How can I see my granddaughter and do my daughter and I have any visitation rights?

My ex wife and I divorced a few years ago, and I got 100% custody of my youngest daughter (now 19 years old). My ex wife was quite mentally unstable and was causing great emotional harm to our youngest daughter, so I divorced her and my youngest has been with me since. She refuses to have contact with her mother. But my ex has long had great influence over our oldest daughter (28 years old & married), and she has convinced our oldest to shun my youngest daughter and me completely. We have only rare contact with her, and she is usually hostile. She recently had my 1st granddaughter, and does not share pictures or info with us, only with her mom. My oldest lives in Hawaii right now so it hasn't come up yet, but I fear that she will try to prevent her sister and me from regular visitation when they move back to Alabama in a couple of years.