Dear Mr. Cyrus,
I just read an article quoting you from GQ regretting your actions as a father. Rather not being a better parent. First of all, let me say that my heart breaks for you as well but also for your wife and children. Since I know that you are a Christian, my first suggestion is that you and your wife put a hold on divorce proceedings and get before God and ask Him to work this out and show you what to do.
You and your wife need to put your marriage back together by putting God first. Of course, I have no way of knowing why the two of you have separated but the best thing you could do for your daughter is to talk to each other and decide to work out your marriage no matter how difficult that may be. You made vows to each other when you got married - for better or worse. Now, most of the world seems to think those vows are disposable but God doesn't. He hasn't given up on your marriage and you need to get beyond how you "feel" emotionally and make a decision to save your family!
I know from experience that when your daughter sees you uniting as one to honor your marriage vows, it will have a major impact on her. I'm not saying it's going to be easy because the two of you will have to rebuild your relationship putting God first in your lives. But doing that will empower God to move in your own hearts and in Miley's.
I just felt like I had to say something as the daughter of parents who chose to stay together when things were at their worst and remained together for 52 years until my father passed away last July. My parents went through a lot and they could easily have given up on their marriage at times but instead they chose to fulfill their vows to each other. I pray that you and your wife will choose to do the same for your own sakes as well as your children's.
I will be praying for all of you...